Add validations if user exist.

main/inc/lib/message.lib.php

@@ -1115,20 +1115,26 @@ class MessageManager
 
         $title = Security::remove_XSS($row['title'], STUDENT, true);
         $content = Security::remove_XSS($row['content'], STUDENT, true);
-        $from_user = api_get_user_info($user_sender_id);
-        $name = $from_user['complete_name_with_username'];
-        $message_content = Display::page_subheader(str_replace("\\", "", $title));
-        $user_image = '';
-        if (api_get_setting('allow_social_tool') == 'true') {
-            $user_image = Display::img(
-                $from_user['avatar_small'],
+
+        $name = get_lang('UnknownUser');
+        $userImage = '';
+        if (!empty($user_sender_id)) {
+            $fromUser = api_get_user_info($user_sender_id);
+            $name = $fromUser['complete_name_with_username'];
+            $userImage = Display::img(
+                $fromUser['avatar_small'],
                 $name,
                 array('title' => $name, 'class' => 'img-responsive img-circle', 'style' => 'max-width:35px'),
                 false
             );
         }
 
+        $message_content = Display::page_subheader(str_replace("\\", "", $title));
+
+        $receiverUserInfo = [];
+        if (!empty($row['user_receiver_id'])) {
             $receiverUserInfo = api_get_user_info($row['user_receiver_id']);
+        }
 
         $message_content .= '<tr>';
         if (api_get_setting('allow_social_tool') == 'true') {
@@ -1136,17 +1142,28 @@ class MessageManager
             if ($source == 'outbox') {
                 $message_content .= '<div class="col-md-12">';
                 $message_content .= '<ul class="list-message">';
-                $message_content .= '<li>'.$user_image.'</li>';
-                $message_content .= '<li><a href="'.api_get_path(WEB_PATH).'main/social/profile.php?u='.$user_sender_id.'">'.$name.'</a> ';
+                $message_content .= '<li>'.$userImage.'</li>';
+                $message_content .= '<li>'.$name.'&nbsp;';
+                if (!empty($receiverUserInfo)) {
                     $message_content .= api_strtolower(get_lang('To')).'&nbsp;<b>'.$receiverUserInfo['complete_name_with_username'].'</b></li>';
+                } else {
+                    $message_content .= api_strtolower(get_lang('To')).'&nbsp;<b>-</b></li>';
+                }
+
                 $message_content .= '<li>'.Display::dateToStringAgoAndLongDate($row['send_date']).'</li>';
                 $message_content .= '</ul>';
                 $message_content .= '</div>';
             } else {
                 $message_content .= '<div class="col-md-12">';
                 $message_content .= '<ul class="list-message">';
-                $message_content .= '<li>'.$user_image.'</li>';
-                $message_content .= '<li><a href="'.api_get_path(WEB_PATH).'main/social/profile.php?u='.$user_sender_id.'">'.$name.'</a> </li>';
+                if (!empty($user_sender_id)) {
+                    $message_content .= '<li>'.$userImage.'</li>';
+                    $message_content .= '<li><a href="'.api_get_path(WEB_PATH).'main/social/profile.php?u='.$user_sender_id.'">'.$name.'</a>';
+                } else {
+                    $message_content .= '<li>'.$name;
+                }
+
+                $message_content .= '&nbsp;'.api_strtolower(get_lang('To')).'&nbsp;'.get_lang('Me');
                 $message_content .= '<li>'.Display::dateToStringAgoAndLongDate($row['send_date']).'</li>';
                 $message_content .= '</ul>';
                 $message_content .= '</div>';
@@ -1155,7 +1172,7 @@ class MessageManager
         } else {
             if ($source == 'outbox') {
                 $message_content .= get_lang('From').':&nbsp;'.$name.'</b> '.api_strtolower(get_lang('To')).' <b>'.
-                    $receiverUserInfo['complete_name'].'</b>';
+                    $receiverUserInfo['complete_name_with_username'].'</b>';
             } else {
                 $message_content .= get_lang('From').':&nbsp;'.$name.'</b> '.api_strtolower(get_lang('To')).' <b>'.
                     get_lang('Me').'</b>';