# Updating a category topic fails with the message «NoMethodError (undefined method \`inner\_html' for nil:NilClass)» when the topic's contents starts with a GitHub onebox

**URL:** <https://meta.discourse.org/t/updating-a-category-topic-fails-with-the-message-nomethoderror-undefined-method-inner-html-for-nil-nilclass-when-the-topics-contents-starts-with-a-github-onebox/56785>\
**Category:** Bug\
**Created:** [2 Febrero, 2017 12:03 UTC](https://meta.discourse.org/t/updating-a-category-topic-fails-with-the-message-nomethoderror-undefined-method-inner-html-for-nil-nilclass-when-the-topics-contents-starts-with-a-github-onebox/56785 "2017-02-02T12:03:56Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![codinghorror](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/codinghorror/32/110067_2.png) [@codinghorror](https://meta.discourse.org/u/codinghorror)\
**Post date:** [3 Febrero, 2017 03:53 UTC](https://meta.discourse.org/t/updating-a-category-topic-fails-with-the-message-nomethoderror-undefined-method-inner-html-for-nil-nilclass-when-the-topics-contents-starts-with-a-github-onebox/56785/2 "2017-02-03T03:53:18Z")

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This is unsupported and will not be “fixed”. The category definition needs actual text, not a onebox.

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_[View the full topic](https://meta.discourse.org/t/updating-a-category-topic-fails-with-the-message-nomethoderror-undefined-method-inner-html-for-nil-nilclass-when-the-topics-contents-starts-with-a-github-onebox/56785)._