Fix issue with anonymous user picture in chat users list - refs #7147

main/chat/chat_whoisonline.php

@@ -121,7 +121,11 @@ if (!empty($course)) {
 						$status = CourseManager::is_course_teacher($user['user_id'], $_SESSION['_course']['id']) ? 1 : 5;
 					}
 				$userImage = UserManager::get_user_picture_path_by_id($user['user_id'], 'web', false, true);
+                                if (substr($userImage['file'],0,7) != 'unknown') {
 				    $fileUrl = $userImage['dir'].'medium_'.$userImage['file'];
+                                } else {
+				    $fileUrl = $userImage['dir'].$userImage['file'];
+                                }
 				$email = $user['email'];
 				$url_user_profile=api_get_path(WEB_CODE_PATH).'social/profile.php?u='.$user['user_id'].'&';
 			?>