diff --git a/pandora_console/include/functions_modules.php b/pandora_console/include/functions_modules.php
index 52ce97df12..c3a1eb1ff4 100755
--- a/pandora_console/include/functions_modules.php
+++ b/pandora_console/include/functions_modules.php
@@ -4872,6 +4872,10 @@ function service_level_module_data($datetime_from, $datetime_to, $id_agentmodule
             $mtrs_array[] = 0;
         } else {
             foreach ($normal_event as $key => $value) {
+                if (isset($failed_event[$key]) === false) {
+                    $failed_event[$key] = end($failed_event);
+                }
+
                 if (($failed_event[$key] - $normal_event[$key]) < 0) {
                     $mtrs_array[] = ($normal_event[$key] - $failed_event[$key]);
                 } else {
diff --git a/pandora_console/include/functions_reporting_html.php b/pandora_console/include/functions_reporting_html.php
index e67bd2b173..e7eef0ae46 100644
--- a/pandora_console/include/functions_reporting_html.php
+++ b/pandora_console/include/functions_reporting_html.php
@@ -2793,8 +2793,8 @@ function reporting_html_service_level($table, $item, $pdf=0)
         $table_info->head[1] = __('% Av.');
         $table_info->head[2] = __('MTBF');
         $table_info->head[3] = __('MTRS');
-        $table_info->head[4] = __('Crit. Events');
-        $table_info->head[5] = __('Warn. Events');
+        $table_info->head[4] = __('Crit. Events').ui_print_help_tip(__('Counted only critical events generated automatic by the module'), true);
+        $table_info->head[5] = __('Warn. Events').ui_print_help_tip(__('Counted only warning events generated automatic by the module'), true);
         $table_info->head[6] = __('Last change');
         $table_info->data = [];
         $table_info->cellstyle = [];