# Bug from nowWhere + Bug with 4.1.0

**URL:** <https://forum.babylonjs.com/t/bug-from-nowwhere-bug-with-4-1-0/5061>\
**Category:** Bugs\
**Created:** [August 13, 2019, 6:23am UTC](https://forum.babylonjs.com/t/bug-from-nowwhere-bug-with-4-1-0/5061 "2019-08-13T06:23:54Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Deltakosh](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/deltakosh/32/26635_2.png) [@Deltakosh](https://forum.babylonjs.com/u/Deltakosh)\
**Post date:** [August 13, 2019, 2:46pm UTC](https://forum.babylonjs.com/t/bug-from-nowwhere-bug-with-4-1-0/5061/2 "2019-08-13T14:46:00Z")

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the 4.0 issue comes from a change in Chrome regarding shader compilation. The spec evolved. So moving to 4.1 is a good idea

For your 4.1 bug, simply set a breaking at Scene.\_evaluateActiveMeshes (scene.ts:3365) or even better set your f12 debugger to break on all exception so the debugger will be triggered when the error will be hit

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