Title: Fatal error: Call to undefined function register_tick_function()
Last modified: August 30, 2016

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# Fatal error: Call to undefined function register_tick_function()

 *  [ahansson89](https://wordpress.org/support/users/ahansson89/)
 * (@ahansson89)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-call-to-undefined-function-register_tick_function/)
 * Fatal error: Call to undefined function register_tick_function() in /usr/share/
   nginx/www/wp-content/plugins/p3-profiler/classes/class.p3-profiler.php on line
   242
 * [https://wordpress.org/plugins/p3-profiler/](https://wordpress.org/plugins/p3-profiler/)

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [Herman Kalungi](https://wordpress.org/support/users/herman-kalungi/)
 * (@herman-kalungi)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-call-to-undefined-function-register_tick_function/#post-6379707)
 * I had the same error from HHVM error log. Can anybody help, please?
 *  [radriaanse](https://wordpress.org/support/users/radriaanse/)
 * (@radriaanse)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-call-to-undefined-function-register_tick_function/#post-6379841)
 * I’ve had this problem too on HHVM 3.8.1. The “workaround” I’ve found is;
 * 1. manually remove /$SITE_ROOT/wp-content/plugins/p3-profiler
    2. also remove/
   $SITE_ROOT/wp-content/mu-plugins/p3-profiler.php 3. reinstall the plugin from
   the wp dashboard and try to start it. It will fail with the fatal error again
   4. Now remove the plugin from the dashboard and reinstall. Now it should start
   correctly

Viewing 2 replies - 1 through 2 (of 2 total)

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 * 2 replies
 * 3 participants
 * Last reply from: [radriaanse](https://wordpress.org/support/users/radriaanse/)
 * Last activity: [10 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-call-to-undefined-function-register_tick_function/#post-6379841)
 * Status: not resolved