# WebGL Error:
**URL:** https://discussions.unity.com/t/webgl-error/655734
**Category:** Web
**Created:** [February 17, 2017, 4:02pm UTC](https://discussions.unity.com/t/webgl-error/655734 "2017-02-17T16:02:00Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@niki\_kyl](https://discussions.unity.com/u/niki_kyl)
#### Post date: [February 17, 2017, 4:02pm UTC](https://discussions.unity.com/t/webgl-error/655734/1 "2017-02-17T16:02:00Z")
Hi,
I am running an error in the WebGL build. The game doesn’t run at all and shows the following error. The game doesn’t show these errors while playing in Unity player. I haven’t changed much in the code since the last build. Please help!
134 UnityLoader.js:6657:2
Invoking error handler due to
uncaught exception: abort(134) at jsStackTrace (Development Build\_17\_2.js:859:12)
stackTrace (Development Build\_17\_2.js:873:11)
abort (Development Build\_17\_2.js:57064:43)
nullFunc\_ii (Development Build\_17\_2.js:45307:2)
b134 (Development Build\_17\_2.asm.js:1038668:1)
MouseMoveHandler(int, EmscriptenMouseEvent const\*, void\*) [\_\_ZL16MouseMoveHandleriPK20EmscriptenMouseEventPv] (Development Build\_17\_2.asm.js:429231:1)
dynCall\_iiii (Development Build\_17\_2.asm.js:980381:1)
dynCall [Runtime.dynCall] (Development Build\_17\_2.js:295:11)
registerMouseEventCallback [JSEvents.registerMouseEventCallback/handlerFunc] (Development Build\_17\_2.js:10215:23)
jsEventHandler (Development Build\_17\_2.js:10117:4)
UnityLoader.js:6531:9
Invalid function pointer called with signature ‘ii’. Perhaps this is an invalid value (e.g. caused by calling a virtual method on a NULL pointer)? Or calling a function with an incorrect type, which will fail? (it is worth building your source files with -Werror (warnings are errors), as warnings can indicate undefined behavior which can cause this) UnityLoader.js:6657:2
Module.printErr file:///D:/Unity%20Credit%20Crush/WebGL\_Builds/Development%20Build\_17\_2/Development/UnityLoader.js:6657:2
nullFunc\_ii blob:null/b6806f55-078c-4a49-8236-b33fc1cc3f98:45305:2
b134 blob:null/d02bbc33-71da-4f98-8468-1227a20a2918:1038668:1
\_\_ZL16MouseMoveHandleriPK20EmscriptenMouseEventPv blob:null/d02bbc33-71da-4f98-8468-1227a20a2918:429231:1
dynCall\_iiii blob:null/d02bbc33-71da-4f98-8468-1227a20a2918:980381:1
Runtime.dynCall blob:null/b6806f55-078c-4a49-8236-b33fc1cc3f98:295:11
JSEvents.registerMouseEventCallback/handlerFunc blob:null/b6806f55-078c-4a49-8236-b33fc1cc3f98:10215:23
jsEventHandler
---
### Author:  [@Marco-Trivellato](https://discussions.unity.com/u/Marco-Trivellato)
#### Post date: [February 22, 2017, 10:16am UTC](https://discussions.unity.com/t/webgl-error/655734/2 "2017-02-22T10:16:01Z")
is this 100% reproducible? could you submit a bug report and post the bug number here?