diff --git a/js/console.js b/js/console.js
index 79aedb448e..ad5893bd4e 100644
--- a/js/console.js
+++ b/js/console.js
@@ -1235,7 +1235,7 @@ PMA_consoleDebug = {
             functionName += dbgStep.type;
         }
         functionName += dbgStep.function;
-        if (dbgStep.args.length) {
+        if (dbgStep.args && dbgStep.args.length) {
             functionName += '(...)';
         } else {
             functionName += '()';
@@ -1303,7 +1303,7 @@ PMA_consoleDebug = {
                             .append(
                             $('<span class="file">').text(this._formatFileName(step))
                         );
-                    if (step.args.length) {
+                    if (step.args && step.args.length) {
                         $stepElem
                             .append(
                             $('<span class="args">').html(this._formatFunctionArgs(step))