diff --git a/implementation/maxflow-push-relabel/js/GoldbergTarjanPushRelabelAlgorithm.js b/implementation/maxflow-push-relabel/js/GoldbergTarjanPushRelabelAlgorithm.js
index 5bf6988..820b710 100644
--- a/implementation/maxflow-push-relabel/js/GoldbergTarjanPushRelabelAlgorithm.js
+++ b/implementation/maxflow-push-relabel/js/GoldbergTarjanPushRelabelAlgorithm.js
@@ -125,7 +125,7 @@ function GoldbergTarjanPushRelabelAlgorithm(svgSelection,svgSelection2) {
      * attach onClick listeners so we can select start/target node
      * @override
      */
-    if(!isDebug){
+    if(!isDebug()){
     this.onNodesEntered = function(selection) {
         //select source and target nodes
         selection
@@ -696,4 +696,4 @@ GoldbergTarjanPushRelabelAlgorithm.prototype = Object.create((isDebug() ? GraphE
 GoldbergTarjanPushRelabelAlgorithm.prototype.constructor = GoldbergTarjanPushRelabelAlgorithm;
 
 //Global variable zuweisen
-GraphAlgorithm = GoldbergTarjanPushRelabelAlgorithm;
\ No newline at end of file
+GraphAlgorithm = GoldbergTarjanPushRelabelAlgorithm;