# How to identify which plugin causes error

**URL:** <https://meta.discourse.org/t/how-to-identify-which-plugin-causes-error/58129>\
**Category:** Product Support\
**Created:** [February 28, 2017, 9:25pm UTC](https://meta.discourse.org/t/how-to-identify-which-plugin-causes-error/58129 "2017-02-28T21:25:05Z")\
**Posts on this page:** 1\
**Showing post:** 1

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**Author:** ![tophee](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/tophee/32/73406_2.png) [@tophee](https://meta.discourse.org/u/tophee)\
**Post date:** [February 28, 2017, 9:25pm UTC](https://meta.discourse.org/t/how-to-identify-which-plugin-causes-error/58129/1 "2017-02-28T21:25:05Z")

</div>

My error log is repeatedly showing this error:

TypeError: Cannot read property ‘on’ of undefined  
at [https://forum.example.com/assets/plugin-third-party-79ea46991b76279d783d995c65d62ffb2f95ae7e68e0c79644ba01b7649d2a95.js:1:14095](https://forum.example.com/assets/plugin-third-party-79ea46991b76279d783d995c65d62ffb2f95ae7e68e0c79644ba01b7649d2a95.js:1:14095)  
at [https://forum.example.com/assets/plugin-third-party-79ea46991b76279d783d995c65d62ffb2f95ae7e68e0c79644ba01b7649d2a95.js:1:14175](https://forum.example.com/assets/plugin-third-party-79ea46991b76279d783d995c65d62ffb2f95ae7e68e0c79644ba01b7649d2a95.js:1:14175)

How do I know which plugin this javascript file is from?

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