diff --git a/classes/Tools.php b/classes/Tools.php
index 8e6c617b4..39027ed14 100644
--- a/classes/Tools.php
+++ b/classes/Tools.php
@@ -1855,8 +1855,8 @@ exit;
 	{
 		$backtrace = debug_backtrace();
 		$callee = next($backtrace);
-		$error = 'Parameter <b>'.$parameter.'</b> in function <b>'.(isset($callee['function']) ? $callee['function'] : '').'()</b> is deprecated in <b>'.$callee['file'].'</b> on line <b>'.(isset($callee['Line']) ? $callee['Line'] : '').'</b><br />';
-		$message = 'The parameter '.$parameter.' in function '.$callee['function'].' (Line '.$callee['Line'].') is deprecated and will be removed in the next major version.';
+		$error = 'Parameter <b>'.$parameter.'</b> in function <b>'.(isset($callee['function']) ? $callee['function'] : '').'()</b> is deprecated in <b>'.$callee['file'].'</b> on line <b>'.(isset($callee['line']) ? $callee['line'] : '(undefined)').'</b><br />';
+		$message = 'The parameter '.$parameter.' in function '.$callee['function'].' (Line '.(isset($callee['line']) ? $callee['line'] : 'undefined').') is deprecated and will be removed in the next major version.';
 		$class = isset($callee['class']) ? $callee['class'] : null;
 
 		Tools::throwDeprecated($error, $message, $class);