diff --git a/pandora_console/general/main_menu.php b/pandora_console/general/main_menu.php
index 1462c717d7..8ed74c4cbd 100644
--- a/pandora_console/general/main_menu.php
+++ b/pandora_console/general/main_menu.php
@@ -36,7 +36,7 @@ if (isset($config['id_user']) === false) {
 <script type="text/javascript" language="javascript">
 
 $(document).ready(function(){    
-    var menuType_value = "<?php echo $_SESSION['menu_type']; ?>";
+    var menuType_value = "<?php echo ($_SESSION['menu_type'] ?? ''); ?>";
 
     if (menuType_value === '' || menuType_value === 'classic') {
         $('ul.submenu').css('left', '214px');    
diff --git a/pandora_console/include/class/ConsoleSupervisor.php b/pandora_console/include/class/ConsoleSupervisor.php
index 214ae2a33c..4f08af3a7c 100644
--- a/pandora_console/include/class/ConsoleSupervisor.php
+++ b/pandora_console/include/class/ConsoleSupervisor.php
@@ -659,15 +659,17 @@ class ConsoleSupervisor
             $_cache_targets = [];
         }
 
-        if ($_cache_targets[$key] !== null) {
+        if (isset($_cache_targets[$key]) === true
+            && $_cache_targets[$key] !== null
+        ) {
             $targets = $_cache_targets[$key];
         } else {
             $targets = get_notification_source_targets(
                 $source_id,
                 $data['type']
             );
-            $this->targetGroups = $targets['groups'];
-            $this->targetUsers = $targets['users'];
+            $this->targetGroups = ($targets['groups'] ?? null);
+            $this->targetUsers = ($targets['users'] ?? null);
 
             $_cache_targets[$key] = $targets;
         }
diff --git a/pandora_console/include/class/HTML.class.php b/pandora_console/include/class/HTML.class.php
index d5bf6dfc97..293a28ecbb 100644
--- a/pandora_console/include/class/HTML.class.php
+++ b/pandora_console/include/class/HTML.class.php
@@ -473,12 +473,13 @@ class HTML
         bool $direct=false
     ) {
         global $config;
+        $text_color = '';
         if ($config['style'] === 'pandora_black') {
             $text_color = 'style="color: white"';
         }
 
         $output = '';
-        if ($input['hidden'] == 1) {
+        if (($input['hidden'] ?? null) == 1) {
             $class = ' hidden';
         } else {
             $class = '';
@@ -488,9 +489,9 @@ class HTML
             $class = $input['class'].$class;
         }
 
-        if (is_array($input['block_content']) === true) {
-            $direct = (bool) $input['direct'];
-            $toggle = (bool) $input['toggle'];
+        if (is_array(($input['block_content'] ?? null)) === true) {
+            $direct = (bool) ($input['direct'] ?? false);
+            $toggle = (bool) ($input['toggle'] ?? false);
 
             if (isset($input['label']) === true) {
                 $output .= '<span '.$text_color.'>'.$input['label'].'</span>';
@@ -499,13 +500,13 @@ class HTML
             // Print independent block of inputs.
             $output .= '<li id="li-'.$input['block_id'].'" class="'.$class.'">';
 
-            if ($input['wrapper']) {
+            if (isset($input['wrapper']) === true) {
                 $output .= '<'.$input['wrapper'].' id="'.$input['block_id'].'" class="'.$class.'">';
             }
 
             if (!$direct) {
                 // Avoid encapsulation if input is direct => 1.
-                $output .= '<ul class="wizard '.$input['block_class'].'">';
+                $output .= '<ul class="wizard '.($input['block_class'] ?? '').'">';
             }
 
             $html = '';
@@ -544,7 +545,7 @@ class HTML
                 $output .= '</ul>';
             }
 
-            if ($input['wrapper']) {
+            if (isset($input['wrapper']) === true) {
                 $output .= '</'.$input['wrapper'].'>';
             }
 
@@ -560,7 +561,7 @@ class HTML
                 }
 
                 if (!$direct) {
-                    $output .= '<li id="'.$input['id'].'" class="'.$class.'">';
+                    $output .= '<li id="'.($input['id'] ?? '').'" class="'.$class.'">';
                 }
 
                 if (isset($input['label']) === true) {
@@ -569,7 +570,7 @@ class HTML
 
                 $output .= self::printInput($input['arguments']);
                 // Allow dynamic content.
-                $output .= $input['extra'];
+                $output .= ($input['extra'] ?? '');
                 if (!$direct) {
                     $output .= '</li>';
                 }
@@ -581,7 +582,7 @@ class HTML
             } else {
                 $output .= self::printInput($input['arguments']);
                 // Allow dynamic content.
-                $output .= $input['extra'];
+                $output .= ($input['extra'] ?? '');
             }
         }
 
@@ -773,13 +774,13 @@ class HTML
         bool $return=false,
         bool $print_white_box=false
     ) {
-        $form = $data['form'];
-        $inputs = $data['inputs'];
-        $rawInputs = $data['rawInputs'];
-        $js = $data['js'];
-        $rawjs = $data['js_block'];
-        $cb_function = $data['cb_function'];
-        $cb_args = $data['cb_args'];
+        $form = ($data['form'] ?? null);
+        $inputs = ($data['inputs'] ?? []);
+        $rawInputs = ($data['rawInputs'] ?? null);
+        $js = ($data['js'] ?? null);
+        $rawjs = ($data['js_block'] ?? null);
+        $cb_function = ($data['cb_function'] ?? null);
+        $cb_args = ($data['cb_args'] ?? null);
 
         $output_head = '';
         if (empty($data['pre-content']) === false) {
@@ -848,7 +849,9 @@ class HTML
         $output .= '<ul class="wizard">';
 
         foreach ($inputs as $input) {
-            if ($input['arguments']['type'] != 'submit') {
+            if (is_array(($input['arguments'] ?? null)) === true
+                && $input['arguments']['type'] != 'submit'
+            ) {
                 $output .= self::printBlock($input, true);
             } else {
                 $output_submit .= self::printBlock($input, true);
diff --git a/pandora_console/include/functions_config.php b/pandora_console/include/functions_config.php
index 27e976d486..70a26aa2ff 100644
--- a/pandora_console/include/functions_config.php
+++ b/pandora_console/include/functions_config.php
@@ -3339,8 +3339,8 @@ function get_um_url()
  */
 function config_return_in_bytes($val)
 {
-    $val = (int) trim($val);
     $last = strtolower($val[(strlen($val) - 1)]);
+    $val = (int) trim($val);
     switch ($last) {
         // The 'G' modifier is available since PHP 5.1.0.
         case 'g':
diff --git a/pandora_console/include/functions_html.php b/pandora_console/include/functions_html.php
index 8b5c83fd50..be68bfa1aa 100644
--- a/pandora_console/include/functions_html.php
+++ b/pandora_console/include/functions_html.php
@@ -2816,7 +2816,7 @@ function html_print_input_number(array $settings):string
                 $output .= $attribute.'="'.$attr_value.'" ';
             }
 
-            $output .= $function.'/>';
+            $output .= '/>';
         }
     }
 
@@ -4472,8 +4472,8 @@ function html_print_switch($attributes=[])
     $html_expand = '';
 
     // Check the load values on status.
-    $html_expand .= (bool) ($attributes['value']) ? ' checked' : '';
-    $html_expand .= (bool) ($attributes['disabled']) ? ' disabled' : '';
+    $html_expand .= (bool) ($attributes['value'] ?? false) ? ' checked' : '';
+    $html_expand .= (bool) ($attributes['disabled'] ?? false) ? ' disabled' : '';
 
     // Only load the valid attributes.
     $valid_attrs = [
@@ -4495,9 +4495,9 @@ function html_print_switch($attributes=[])
         $attributes['style'] = '';
     }
 
-    $disabled_class = (bool) ($attributes['disabled']) ? ' p-slider-disabled' : '';
+    $disabled_class = (bool) ($attributes['disabled'] ?? false) ? ' p-slider-disabled' : '';
 
-    return "<label class='p-switch ".$attributes['container-class']."' style='".$attributes['style']."'>
+    return "<label class='p-switch ".($attributes['container-class'] ?? '')."' style='".($attributes['style'] ?? '')."'>
 			<input type='checkbox' ".$html_expand.">
 			<span class='p-slider".$disabled_class."'></span>
 		</label>";
@@ -4573,7 +4573,7 @@ function html_print_input($data, $wrapper='div', $input_only=false)
 
     $output = '';
 
-    if ($data['label'] && $input_only === false) {
+    if (($data['label'] ?? false) && $input_only === false) {
         $output = '<'.$wrapper.' id="'.$wrapper.'-'.$data['name'].'" ';
         $output .= ' class="'.$data['input_class'].'">';
         $output .= '<label '.$style.' class="'.$data['label_class'].'">';
@@ -5165,7 +5165,7 @@ function html_print_input($data, $wrapper='div', $input_only=false)
         $output .= '</'.$data['wrapper'].'>';
     }
 
-    if ($data['label'] && $input_only === false) {
+    if (($data['label'] ?? false) && $input_only === false) {
         $output .= '</'.$wrapper.'>';
         if (!$data['return']) {
             echo '</'.$wrapper.'>';
diff --git a/pandora_console/include/functions_menu.php b/pandora_console/include/functions_menu.php
index fe3ec5ebfe..15d7f1976c 100644
--- a/pandora_console/include/functions_menu.php
+++ b/pandora_console/include/functions_menu.php
@@ -395,7 +395,15 @@ function menu_print_menu(&$menu)
         }
 
         // Choose valid section (sec).
-        if (enterprise_hook('enterprise_acl', [$config['id_user'], $mainsec, $main['sec2']]) == false) {
+        if ((bool) enterprise_hook(
+            'enterprise_acl',
+            [
+                $config['id_user'],
+                $mainsec,
+                ($main['sec2'] ?? null),
+            ]
+        ) === false
+        ) {
             if ($count_sub_access > 0) {
                 // If any susection have access but main section not, we change main link to first subsection found
                 $main['sec2'] = $first_sub_sec2;
diff --git a/pandora_console/index.php b/pandora_console/index.php
index b9e3585579..e2bec93ee2 100755
--- a/pandora_console/index.php
+++ b/pandora_console/index.php
@@ -1010,7 +1010,7 @@ if (isset($_GET['bye'])) {
 
 clear_pandora_error_for_header();
 
-if ((bool) $config['node_deactivated'] === true) {
+if ((bool) ($config['node_deactivated'] ?? false) === true) {
     // Prevent access node if not merged.
     include 'general/node_deactivated.php';
 
@@ -1021,7 +1021,7 @@ if ((bool) $config['node_deactivated'] === true) {
     exit('</html>');
 }
 
-if ((bool) $config['maintenance_mode'] === true
+if ((bool) ($config['maintenance_mode'] ?? false) === true
     && (bool) users_is_admin() === false
 ) {
     // Show maintenance web-page. For non-admin users only.
@@ -1082,7 +1082,7 @@ if (get_parameter('login', 0) !== 0) {
 }
 
 
-if ((bool) $config['maintenance_mode'] === true
+if ((bool) ($config['maintenance_mode'] ?? false) === true
     && (bool) users_is_admin() === false
 ) {
     // Show maintenance web-page. For non-admin users only.