Title: Plugin Conflict
Last modified: August 30, 2016

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# Plugin Conflict

 *  [knill13](https://wordpress.org/support/users/knill13/)
 * (@knill13)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/plugin-conflict-92/)
 * Fatal error: Call to undefined function is_user_logged_in() in D:\xampp\apps\
   wordpress\htdocs\wp-content\plugins\user-language-switch\user-language-switch.
   php on line 117
 * I get this error with when activating wpMandrill with User Language Switch plugin
   active
 * [https://wordpress.org/plugins/wpmandrill/](https://wordpress.org/plugins/wpmandrill/)

The topic ‘Plugin Conflict’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/wpmandrill_171717.svg)
 * [wpMandrill](https://wordpress.org/plugins/wpmandrill/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wpmandrill/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wpmandrill/)
 * [Active Topics](https://wordpress.org/support/plugin/wpmandrill/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wpmandrill/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wpmandrill/reviews/)

 * 0 replies
 * 1 participant
 * Last reply from: [knill13](https://wordpress.org/support/users/knill13/)
 * Last activity: [10 years, 10 months ago](https://wordpress.org/support/topic/plugin-conflict-92/)
 * Status: not resolved