Title: Call to undefined function “Jetpack::is_module_active”
Last modified: May 20, 2020

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# Call to undefined function “Jetpack::is_module_active”

 *  [massivescale](https://wordpress.org/support/users/massivescale/)
 * (@massivescale)
 * [6 years ago](https://wordpress.org/support/topic/call-to-undefined-function-jetpackis_module_active/)
 * If you’re getting the error from topic, desctivate the “JP custom CSS” plugin,
   it breaks Woocommerce, Customizer and possibly other plugins.

The topic ‘Call to undefined function “Jetpack::is_module_active”’ is closed to 
new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/jp-custom-css.svg)
 * [JP Custom CSS](https://wordpress.org/plugins/jp-custom-css/)
 * [Support Threads](https://wordpress.org/support/plugin/jp-custom-css/)
 * [Active Topics](https://wordpress.org/support/plugin/jp-custom-css/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/jp-custom-css/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/jp-custom-css/reviews/)

## Tags

 * [fatal error](https://wordpress.org/support/topic-tag/fatal-error/)

 * 0 replies
 * 1 participant
 * Last reply from: [massivescale](https://wordpress.org/support/users/massivescale/)
 * Last activity: [6 years ago](https://wordpress.org/support/topic/call-to-undefined-function-jetpackis_module_active/)
 * Status: not a support question