Error in browser console: "TypeError: c(...).forEach is not a function"

Hi guys, 

While testing my application in Mendix 7.2.0, I have the following error: "TypeError: c(...).forEach is not a function"

This happened when I pressed a button on a page (calling microflow) without using widgets. The first action in the microflow had a breakpoint and it didnt even reach that one. This error only occured after the upgrade to 7.2.0. I found the error (listed below) in the console (pressing F12 in the browser), because Mendix didn't show me an error.

Any thoughts on this?

s/</< http://localhost1:81/mxclientsystem/mxui/mxui.js:5:273514
	forEach self-hosted:251:13
	s/< http://localhost1:81/mxclientsystem/mxui/mxui.js:5:273434
	forEach self-hosted:251:13
	s http://localhost1:81/mxclientsystem/mxui/mxui.js:5:273412
	o http://localhost1:81/mxclientsystem/mxui/mxui.js:5:273040
	value http://localhost1:81/mxclientsystem/mxui/mxui.js:10:242612
	i.prototype.action http://localhost1:81/mxclientsystem/mxui/mxui.js:10:232830
	o/this.action http://localhost1:81/mxclientsystem/mxui/mxui.js:10:71885
	window.mx.data.action http://localhost1:81/mxclientsystem/mxui/mxui.js:5:466827
	i/this.action http://localhost1:81/mxclientsystem/mxui/mxui.js:10:133024
	window.mx.ui.action http://localhost1:81/mxclientsystem/mxui/mxui.js:5:469615<anoniem> http://localhost1:81/mxclientsystem/mxui/mxui.js:10:106415
	r http://localhost1:81/mxclientsystem/mxui/mxui.js:5:134752
	t.exports.sequence http://localhost1:81/mxclientsystem/mxui/mxui.js:5:134525<anoniem> http://localhost1:81/mxclientsystem/mxui/mxui.js:10:106391
	execute http://localhost1:81/mxclientsystem/mxui/mxui.js:5:172955
	i/this.execute http://localhost1:81/mxclientsystem/mxui/mxui.js:10:132714
	window.mx.ui.execute http://localhost1:81/mxclientsystem/mxui/mxui.js:5:469319
	onClick http://localhost1:81/mxclientsystem/mxui/mxui.js:10:137512
	_onClick http://localhost1:81/mxclientsystem/mxui/mxui.js:5:223162
	hitch/< http://localhost1:81/mxclientsystem/mxui/mxui.js:5:26608