Title: undefined function pll__()
Last modified: September 1, 2016

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# undefined function pll__()

 *  [webstartup](https://wordpress.org/support/users/webstartup/)
 * (@webstartup)
 * [9 years, 10 months ago](https://wordpress.org/support/topic/undefined-function-pll_/)
 * Hello,
 * [ERREUR FATALE] => 23.06.2016 12:22:07
    Call to undefined function pll__() dans
   wp-content/themes/wlw/app/template/composants/post-type-categories.php (14)
 * after migrate 1.9 to 1.9.2 what to do ?
 * [https://wordpress.org/plugins/polylang/](https://wordpress.org/plugins/polylang/)

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

 *  Thread Starter [webstartup](https://wordpress.org/support/users/webstartup/)
 * (@webstartup)
 * [9 years, 10 months ago](https://wordpress.org/support/topic/undefined-function-pll_/#post-7509894)
 * I’m sorry, I had not noticed that the plugin is disabled when the update is resolved.
 *  Plugin Support [Chrystl](https://wordpress.org/support/users/chrystl/)
 * (@chrystl)
 * [9 years, 10 months ago](https://wordpress.org/support/topic/undefined-function-pll_/#post-7509992)
 * Hi
    You use a Polylang function in your theme. So you must do that: ‘when using
   one or more of these function, you *must* check for its existence before using
   it, otherwise your site will badly break with a fatal error at next Polylang 
   update (as WordPress deletes the plugin when updating it).’ See the doc (the 
   introduction): [https://polylang.pro/doc/function-reference/](https://polylang.pro/doc/function-reference/)

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

The topic ‘undefined function pll__()’ is closed to new replies.

 * ![](https://ps.w.org/polylang/assets/icon-256x256.png?rev=3433336)
 * [Polylang](https://wordpress.org/plugins/polylang/)
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 * 2 replies
 * 2 participants
 * Last reply from: [Chrystl](https://wordpress.org/support/users/chrystl/)
 * Last activity: [9 years, 10 months ago](https://wordpress.org/support/topic/undefined-function-pll_/#post-7509992)
 * Status: not resolved