diff --git a/pandora_console/general/header.php b/pandora_console/general/header.php
index 35b994fead..0110e745ae 100644
--- a/pandora_console/general/header.php
+++ b/pandora_console/general/header.php
@@ -161,6 +161,10 @@ echo sprintf('<div id="header_table" class="header_table_%s">', $menuTypeClass);
             'code'         => false,
         ];
 
+        if (isset($_GET['sec']) === false) {
+            $_GET['sec'] = '';
+        }
+
         if (!isset($_GET['sec2'])) {
             $_GET['sec2'] = '';
         }
diff --git a/pandora_console/general/noaccess.php b/pandora_console/general/noaccess.php
index b2fe4515a2..9299489864 100644
--- a/pandora_console/general/noaccess.php
+++ b/pandora_console/general/noaccess.php
@@ -152,9 +152,11 @@
                 echo __('Access to this page is restricted to authorized users only, please contact system administrator if you need assistance.');
                 echo '<br/> <br/>';
                 echo __('Please know that all attempts to access this page are recorded in security logs of %s System Database', get_product_name());
-                if ($config['logged'] == false) {
-                    if (session_status() === PHP_SESSION_ACTIVE) {
-                        session_destroy();
+                if (isset($config['logged']) === true) {
+                    if ($config['logged'] == false) {
+                        if (session_status() === PHP_SESSION_ACTIVE) {
+                            session_destroy();
+                        }
                     }
                 }
                 ?>
diff --git a/pandora_console/godmode/menu.php b/pandora_console/godmode/menu.php
index 3505e7cf2c..db8d1132c3 100644
--- a/pandora_console/godmode/menu.php
+++ b/pandora_console/godmode/menu.php
@@ -521,10 +521,12 @@ if ($access_console_node === true) {
 if ((bool) check_acl($config['id_user'], 0, 'AW') === true) {
     $show_ipam = false;
     $ipam = db_get_all_rows_sql('SELECT users_operator FROM tipam_network');
-    foreach ($ipam as $row) {
-        if (str_contains($row['users_operator'], '-1') || str_contains($row['users_operator'], $config['id_user'])) {
-            $show_ipam = true;
-            break;
+    if ($ipam !== false) {
+        foreach ($ipam as $row) {
+            if (str_contains($row['users_operator'], '-1') || str_contains($row['users_operator'], $config['id_user'])) {
+                $show_ipam = true;
+                break;
+            }
         }
     }
 }
diff --git a/pandora_console/godmode/wizards/ManageExtensions.class.php b/pandora_console/godmode/wizards/ManageExtensions.class.php
index 34c9950bc6..deb2a4dbf5 100644
--- a/pandora_console/godmode/wizards/ManageExtensions.class.php
+++ b/pandora_console/godmode/wizards/ManageExtensions.class.php
@@ -214,7 +214,8 @@ class ManageExtensions extends HTML
                 break;
 
                 default:
-                continue;
+                    // Nothing.
+                break;
             }
         }
 
diff --git a/pandora_console/include/class/ExtensionsDiscovery.class.php b/pandora_console/include/class/ExtensionsDiscovery.class.php
index b9b5d0ebf2..f132cc160f 100644
--- a/pandora_console/include/class/ExtensionsDiscovery.class.php
+++ b/pandora_console/include/class/ExtensionsDiscovery.class.php
@@ -2190,7 +2190,8 @@ class ExtensionsDiscovery extends Wizard
                 break;
 
                 default:
-                continue;
+                    // Nothing.
+                break;
             }
 
             if ($value !== false) {
diff --git a/pandora_console/include/class/WelcomeWindow.class.php b/pandora_console/include/class/WelcomeWindow.class.php
index 4a157540c5..ba9c89e350 100644
--- a/pandora_console/include/class/WelcomeWindow.class.php
+++ b/pandora_console/include/class/WelcomeWindow.class.php
@@ -376,10 +376,6 @@ class WelcomeWindow extends Wizard
             'class'    => 'modal',
         ];
 
-        if (enterprise_installed() === true) {
-            $logo_url = ENTERPRISE_DIR.'/'.$logo_url;
-        }
-
         if (check_acl($config['id_user'], 0, 'PM')) {
             $flag_um = false;
             $flag_cm = false;
@@ -768,6 +764,10 @@ class WelcomeWindow extends Wizard
                 ],
                 true
             );
+            if (isset($agents_num) === false) {
+                $agents_num = '';
+            }
+
             echo html_print_label_input_block(
                 __('Number of agents to be created'),
                 html_print_div(
@@ -893,6 +893,10 @@ class WelcomeWindow extends Wizard
                 __('Agent'),
                 ui_print_agent_autocomplete_input($params)
             );
+            if (isset($modules) === false) {
+                $modules = '';
+            }
+
             echo html_print_label_input_block(
                 __('Module'),
                 html_print_select(
diff --git a/pandora_console/include/functions_graph.php b/pandora_console/include/functions_graph.php
index f713f68ee0..ce8a10527c 100644
--- a/pandora_console/include/functions_graph.php
+++ b/pandora_console/include/functions_graph.php
@@ -4701,11 +4701,13 @@ function graph_nodata_image($options)
 {
     global $config;
 
-    if ($options['base64'] === true) {
-        $dataImg = file_get_contents(
-            $config['homedir'].'/images/image_problem_area_150.png'
-        );
-        return base64_encode($dataImg);
+    if (isset($options['base64']) === true) {
+        if ($options['base64'] === true) {
+            $dataImg = file_get_contents(
+                $config['homedir'].'/images/image_problem_area_150.png'
+            );
+            return base64_encode($dataImg);
+        }
     }
 
     $style = '';
diff --git a/pandora_console/include/functions_register.php b/pandora_console/include/functions_register.php
index db1bc8bf21..6b1d6ec0a7 100644
--- a/pandora_console/include/functions_register.php
+++ b/pandora_console/include/functions_register.php
@@ -144,7 +144,7 @@ function config_wiz_modal(
         'UTC'        => __('UTC'),
     ];
 
-    if ($zone_selected == '') {
+    if (isset($zone_selected) === false) {
         if ($config['timezone'] != '') {
             $zone_array = explode('/', $config['timezone']);
             $zone_selected = $zone_array[0];
diff --git a/pandora_console/include/functions_reports.php b/pandora_console/include/functions_reports.php
index bb9f57f5c3..c8e774acc7 100755
--- a/pandora_console/include/functions_reports.php
+++ b/pandora_console/include/functions_reports.php
@@ -1435,7 +1435,7 @@ function custom_fields_macros_report($macro, $key_macro)
                         $macro['server_id']
                     );
                     if (metaconsole_connect($server) != NOERR) {
-                        continue;
+                        break;
                     }
                 }
 
diff --git a/pandora_console/include/functions_ui.php b/pandora_console/include/functions_ui.php
index 09803c43c6..bcf23c6d71 100755
--- a/pandora_console/include/functions_ui.php
+++ b/pandora_console/include/functions_ui.php
@@ -4004,19 +4004,21 @@ function ui_print_datatable(array $parameters)
     $parameters['order']['order'] = $order;
     $parameters['order']['direction'] = $direction;
 
-    foreach ($parameters['no_sortable_columns'] as $key => $find) {
-        $found = array_search(
-            $parameters['no_sortable_columns'][$key],
-            $columns_tmp
-        );
+    if (isset($parameters['no_sortable_columns']) === true) {
+        foreach ($parameters['no_sortable_columns'] as $key => $find) {
+            $found = array_search(
+                $parameters['no_sortable_columns'][$key],
+                $columns_tmp
+            );
 
-        if ($found !== false) {
-            unset($parameters['no_sortable_columns'][$key]);
-            array_push($parameters['no_sortable_columns'], $found);
-        }
+            if ($found !== false) {
+                unset($parameters['no_sortable_columns'][$key]);
+                array_push($parameters['no_sortable_columns'], $found);
+            }
 
-        if (is_int($parameters['no_sortable_columns'][$key]) === false) {
-            unset($parameters['no_sortable_columns'][$key]);
+            if (is_int($parameters['no_sortable_columns'][$key]) === false) {
+                unset($parameters['no_sortable_columns'][$key]);
+            }
         }
     }
 
@@ -4234,7 +4236,7 @@ function ui_print_datatable(array $parameters)
     }
 
     $parameters['phpDate'] = date('Y-m-d');
-    $parameters['dataElements'] = json_encode($parameters['data_element']);
+    $parameters['dataElements'] = (isset($parameters['data_element']) === true) ? json_encode($parameters['data_element']) : '';
 
     // * START JAVASCRIPT.
     $file_path = $config['homedir'].'/include/javascript/datatablesFunction.js';
diff --git a/pandora_console/include/graphs/fgraph.php b/pandora_console/include/graphs/fgraph.php
index d8db7d64d9..5861f67033 100644
--- a/pandora_console/include/graphs/fgraph.php
+++ b/pandora_console/include/graphs/fgraph.php
@@ -1355,12 +1355,12 @@ function get_build_setup_charts($type, $options, $data)
                 $chart->labels()->exchangeArray($options['labels']);
                 foreach ($data as $key => $dataset) {
                     $dataSet = $chart->createDataSet();
-                    $dataSet->setLabel($dataset['label']);
+                    $dataSet->setLabel((isset($dataset['label']) === true) ? $dataset['label'] : '');
                     $dataSet->setBackgroundColor($dataset['backgroundColor']);
                     $dataSet->setBorderColor($dataset['borderColor']);
                     $dataSet->setPointBackgroundColor($dataset['pointBackgroundColor']);
-                    $dataSet->setPointBorderColor($dataset['pointBorderColor']);
-                    $dataSet->setPointHoverBackgroundColor($dataset['pointHoverBackgroundColor']);
+                    $dataSet->setPointBorderColor((isset($dataset['pointBorderColor']) === true) ? $dataset['pointBorderColor'] : '');
+                    $dataSet->setPointHoverBackgroundColor((isset($dataset['pointHoverBackgroundColor']) === true) ? $dataset['pointHoverBackgroundColor'] : '');
                     $dataSet->setPointHoverBorderColor($dataset['pointHoverBorderColor']);
                     $dataSet->data()->exchangeArray($dataset['data']);
                     $chart->addDataSet($dataSet);
diff --git a/pandora_console/include/lib/TacticalView/GeneralTacticalView.php b/pandora_console/include/lib/TacticalView/GeneralTacticalView.php
index 06e27e4fd6..02f60f8252 100644
--- a/pandora_console/include/lib/TacticalView/GeneralTacticalView.php
+++ b/pandora_console/include/lib/TacticalView/GeneralTacticalView.php
@@ -144,9 +144,11 @@ class GeneralTacticalView
     {
         $js = '<script>';
         foreach ($this->elements as $key => $element) {
-            if ($element->interval > 0) {
-                foreach ($element->refreshConfig as $key => $conf) {
-                    $js .= 'autoRefresh('.$element->interval.',"'.$conf['id'].'", "'.$conf['method'].'", "'.$element->nameClass().'");';
+            if (isset($element->interval) === true) {
+                if ($element->interval > 0) {
+                    foreach ($element->refreshConfig as $key => $conf) {
+                        $js .= 'autoRefresh('.$element->interval.',"'.$conf['id'].'", "'.$conf['method'].'", "'.$element->nameClass().'");';
+                    }
                 }
             }
         }
diff --git a/pandora_console/include/lib/TacticalView/elements/Agents.php b/pandora_console/include/lib/TacticalView/elements/Agents.php
index bb2df62eb4..171a31f580 100644
--- a/pandora_console/include/lib/TacticalView/elements/Agents.php
+++ b/pandora_console/include/lib/TacticalView/elements/Agents.php
@@ -34,6 +34,7 @@ class Agents extends Element
      */
     public function __construct()
     {
+        global $config;
         parent::__construct();
         include_once $config['homedir'].'/include/graphs/fgraph.php';
         include_once $config['homedir'].'/include/functions_graph.php';
diff --git a/pandora_console/include/lib/TacticalView/elements/Events.php b/pandora_console/include/lib/TacticalView/elements/Events.php
index 1c87f4cc9e..de38641fe8 100644
--- a/pandora_console/include/lib/TacticalView/elements/Events.php
+++ b/pandora_console/include/lib/TacticalView/elements/Events.php
@@ -391,7 +391,8 @@ class Events extends Element
                 break;
 
                 default:
-                continue;
+                    // Nothing.
+                break;
             }
 
             $labels[] = $this->controlSizeText($label);
diff --git a/pandora_console/include/lib/TacticalView/elements/Groups.php b/pandora_console/include/lib/TacticalView/elements/Groups.php
index 7a691d6b7c..d1bfda4e77 100644
--- a/pandora_console/include/lib/TacticalView/elements/Groups.php
+++ b/pandora_console/include/lib/TacticalView/elements/Groups.php
@@ -73,6 +73,9 @@ class Groups extends Element
     public function getStatusHeatMap():string
     {
         global $config;
+        if (isset($config['id_group']) === false) {
+            $config['id_group'] = false;
+        }
 
         $groups = users_get_groups($config['id_group'], 'AR', false);
         if (is_array($groups) === true && count($groups) >= 10) {
diff --git a/pandora_console/include/lib/TacticalView/elements/MonitoringElements.php b/pandora_console/include/lib/TacticalView/elements/MonitoringElements.php
index 8a572219bd..b5722e5646 100644
--- a/pandora_console/include/lib/TacticalView/elements/MonitoringElements.php
+++ b/pandora_console/include/lib/TacticalView/elements/MonitoringElements.php
@@ -34,6 +34,7 @@ class MonitoringElements extends Element
      */
     public function __construct()
     {
+        global $config;
         parent::__construct();
         include_once $config['homedir'].'/include/graphs/fgraph.php';
         include_once $config['homedir'].'/include/functions_graph.php';
@@ -58,13 +59,15 @@ class MonitoringElements extends Element
 
         $labels = [];
         $data = [];
-        foreach ($rows as $key => $row) {
-            if (empty($row['name']) === true) {
-                continue;
-            }
+        if ($rows !== false) {
+            foreach ($rows as $key => $row) {
+                if (empty($row['name']) === true) {
+                    continue;
+                }
 
-            $labels[] = $this->controlSizeText($row['name']);
-            $data[] = $row['total'];
+                $labels[] = $this->controlSizeText($row['name']);
+                $data[] = $row['total'];
+            }
         }
 
         $options = [
diff --git a/pandora_console/include/lib/TacticalView/elements/ScheduledDowntime.php b/pandora_console/include/lib/TacticalView/elements/ScheduledDowntime.php
index 563e59b0f2..2947180b12 100644
--- a/pandora_console/include/lib/TacticalView/elements/ScheduledDowntime.php
+++ b/pandora_console/include/lib/TacticalView/elements/ScheduledDowntime.php
@@ -156,6 +156,10 @@ class ScheduledDowntime extends Element
                 'cron_interval_from',
                 'cron_interval_to',
             ];
+            if (isset($config['user']) === false) {
+                $config['user'] = '';
+            }
+
             $groups = implode(',', array_keys(users_get_groups($config['user'])));
             $columns_str = implode(',', $columns);
             $sql = sprintf(
@@ -170,49 +174,51 @@ class ScheduledDowntime extends Element
             );
 
             $sql_count = 'SELECT COUNT(id) AS num
-                          FROM tplanned_downtime';
+                            FROM tplanned_downtime';
 
             $downtimes = db_get_all_rows_sql($sql);
-            foreach ($downtimes as $key => $downtime) {
-                if ((int) $downtime['executed'] === 0) {
-                    $downtimes[$key]['running'] = html_print_div(
+            if ($downtimes !== false) {
+                foreach ($downtimes as $key => $downtime) {
+                    if ((int) $downtime['executed'] === 0) {
+                        $downtimes[$key]['running'] = html_print_div(
+                            [
+                                'content' => '',
+                                'class'   => 'square stop',
+                                'title'   => 'Not running',
+                            ],
+                            true
+                        );
+                    } else {
+                        $downtimes[$key]['running'] = html_print_div(
+                            [
+                                'content' => '',
+                                'class'   => 'square running',
+                                'title'   => 'Running',
+                            ],
+                            true
+                        );
+                    }
+
+                    $downtimes[$key]['configuration'] = reporting_format_planned_downtime_dates($downtime);
+
+                    $settings = [
+                        'url'         => ui_get_full_url('ajax.php', false, false, false),
+                        'loadingText' => __('Loading, this operation might take several minutes...'),
+                        'title'       => __('Elements affected'),
+                        'id'          => $downtime['id'],
+                    ];
+
+                    $downtimes[$key]['affected'] = '<a style="margin-left: 22px;" href="javascript:" onclick=\'dialogAgentModulesAffected('.json_encode($settings).')\'>';
+                    $downtimes[$key]['affected'] .= html_print_image(
+                        'images/details.svg',
+                        true,
                         [
-                            'content' => '',
-                            'class'   => 'square stop',
-                            'title'   => 'Not running',
-                        ],
-                        true
-                    );
-                } else {
-                    $downtimes[$key]['running'] = html_print_div(
-                        [
-                            'content' => '',
-                            'class'   => 'square running',
-                            'title'   => 'Running',
-                        ],
-                        true
+                            'title' => __('Agents and modules affected'),
+                            'class' => 'main_menu_icon invert_filter',
+                        ]
                     );
+                    $downtimes[$key]['affected'] .= '</a>';
                 }
-
-                $downtimes[$key]['configuration'] = reporting_format_planned_downtime_dates($downtime);
-
-                $settings = [
-                    'url'         => ui_get_full_url('ajax.php', false, false, false),
-                    'loadingText' => __('Loading, this operation might take several minutes...'),
-                    'title'       => __('Elements affected'),
-                    'id'          => $downtime['id'],
-                ];
-
-                $downtimes[$key]['affected'] = '<a style="margin-left: 22px;" href="javascript:" onclick=\'dialogAgentModulesAffected('.json_encode($settings).')\'>';
-                $downtimes[$key]['affected'] .= html_print_image(
-                    'images/details.svg',
-                    true,
-                    [
-                        'title' => __('Agents and modules affected'),
-                        'class' => 'main_menu_icon invert_filter',
-                    ]
-                );
-                $downtimes[$key]['affected'] .= '</a>';
             }
 
             $downtimes_number_res = db_get_all_rows_sql($sql_count);
diff --git a/pandora_console/index.php b/pandora_console/index.php
index 96d4ed6bb6..244778a75b 100755
--- a/pandora_console/index.php
+++ b/pandora_console/index.php
@@ -1462,6 +1462,10 @@ if ($searchPage) {
                 // Make file path absolute to prevent accessing remote files.
                 $file = __DIR__.'/'.$file;
                 // Translate some secs.
+                if (isset($_GET['sec']) === false) {
+                    $_GET['sec'] = '';
+                }
+
                 $main_sec = get_sec($_GET['sec']);
                 $_GET['sec'] = ($main_sec == false) ? $_GET['sec'] : $main_sec;
 
diff --git a/pandora_console/operation/events/events.php b/pandora_console/operation/events/events.php
index 8da1863bf4..f42d889c5f 100644
--- a/pandora_console/operation/events/events.php
+++ b/pandora_console/operation/events/events.php
@@ -130,10 +130,15 @@ $severity = get_parameter(
     'filter[severity]',
     ($filter['severity'] ?? '')
 );
-$regex = get_parameter(
-    'filter[regex]',
-    (io_safe_output($filter['regex']) ?? '')
-);
+if (isset($filter['regex']) === true) {
+    $regex = get_parameter(
+        'filter[regex]',
+        (io_safe_output($filter['regex']) ?? '')
+    );
+} else {
+    $regex = '';
+}
+
 unset($filter['regex']);
 $status = get_parameter(
     'filter[status]',
diff --git a/pandora_console/views/dashboard/tipsWindow.php b/pandora_console/views/dashboard/tipsWindow.php
index d2714ae1f2..3d5b284f3f 100644
--- a/pandora_console/views/dashboard/tipsWindow.php
+++ b/pandora_console/views/dashboard/tipsWindow.php
@@ -26,6 +26,10 @@
  * ============================================================================
  */
 
+if (isset($preview) === false) {
+    $preview = '';
+}
+
 $output = '';
 $output .= '<script>var idTips = ['.$id.'];</script>';
 $output .= '<div class="window">';
@@ -58,7 +62,7 @@ if ($files !== false) {
     }
 }
 
-if ($files64 !== false) {
+if (isset($files64) === true) {
     foreach ($files64 as $key => $file) {
         $output .= '<img src="'.$file.'" />';
     }