diff --git a/root/portal/modules/portal_birthday_list.php b/root/portal/modules/portal_birthday_list.php
index 22e89ff4..d357aa35 100644
--- a/root/portal/modules/portal_birthday_list.php
+++ b/root/portal/modules/portal_birthday_list.php
@@ -174,8 +174,23 @@ class portal_birthday_list_module
 
 		$date = explode('-', $birthday);
 		$time = mktime(0, 0, 0, $date[1], $date[0], $date[2]);
-		$lang_dates = $user->lang['datetime'];
+		$lang_dates = array_filter($user->lang['datetime'], array($this, 'filter_lang_dates'));
 
 		return strtr(date($date_settings, $time), $lang_dates);
 	}
+
+	/**
+	* Filter out lang dates that are not arrays.
+	* This is required in order to prevent PHP notices in PHP >= 5.4.12
+	* that happen if an array that is passed to strtr() has rows that are
+	* arrays.
+	*
+	* @param mixed $row Current row of array
+	*
+	* @return bool True if array row is not an array
+	*/
+	protected function filter_lang_dates($row)
+	{
+		return !is_array($row);
+	}
 }