diff --git a/src/diagrams/class/classDb.js b/src/diagrams/class/classDb.js
index c605734c28..79dca1d1fe 100644
--- a/src/diagrams/class/classDb.js
+++ b/src/diagrams/class/classDb.js
@@ -217,7 +217,7 @@ const setClickFunc = function(domId, functionName, tooltip) {
         elem.addEventListener(
           'click',
           function() {
-            window[functionName](elemId);
+            utils.runFunc(functionName, elemId);
           },
           false
         );
diff --git a/src/diagrams/flowchart/flowDb.js b/src/diagrams/flowchart/flowDb.js
index c2ed7392e9..0c0098bbb6 100644
--- a/src/diagrams/flowchart/flowDb.js
+++ b/src/diagrams/flowchart/flowDb.js
@@ -232,7 +232,7 @@ const setClickFun = function(_id, functionName) {
         elem.addEventListener(
           'click',
           function() {
-            window[functionName](id);
+            utils.runFunc(functionName, id);
           },
           false
         );
diff --git a/src/diagrams/gantt/ganttDb.js b/src/diagrams/gantt/ganttDb.js
index 702dc78b68..0c01ab2578 100644
--- a/src/diagrams/gantt/ganttDb.js
+++ b/src/diagrams/gantt/ganttDb.js
@@ -2,6 +2,7 @@ import moment from 'moment-mini';
 import { sanitizeUrl } from '@braintree/sanitize-url';
 import { logger } from '../../logger';
 import { getConfig } from '../../config';
+import utils from '../../utils';
 
 const config = getConfig();
 let dateFormat = '';
@@ -520,7 +521,7 @@ const setClickFun = function(id, functionName, functionArgs) {
   let rawTask = findTaskById(id);
   if (typeof rawTask !== 'undefined') {
     pushFun(id, () => {
-      window[functionName](...argList);
+      utils.runFunc(functionName, ...argList);
     });
   }
 };
diff --git a/src/utils.js b/src/utils.js
index 9c293f49e0..d2066bc23a 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -127,6 +127,21 @@ export const formatUrl = (linkStr, config) => {
   }
 };
 
+export const runFunc = (functionName, ...params) => {
+  var arrPaths = functionName.split('.');
+
+  var len = arrPaths.length - 1;
+  var fnName = arrPaths[len];
+
+  var obj = window;
+  for (var i = 0; i < len; i++) {
+    obj = obj[arrPaths[i]];
+    if (!obj) return;
+  }
+
+  obj[fnName](...params);
+};
+
 const distance = (p1, p2) =>
   p1 && p2 ? Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2)) : 0;
 
@@ -262,5 +277,6 @@ export default {
   calcCardinalityPosition,
   formatUrl,
   getStylesFromArray,
-  generateId
+  generateId,
+  runFunc
 };