Title: po[0] html undefined
Last modified: November 6, 2017
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# po[0] html undefined
* Resolved [Tunn](https://wordpress.org/support/users/iuriem/)
* (@iuriem)
* [8 years, 6 months ago](https://wordpress.org/support/topic/po0-html-undefined/)
* What this means: _[po[0] html undefined](https://78.media.tumblr.com/b2eed9092d0ad175f8f6c0399891292e/tumblr_oyzsxiBz6i1rxg1n8o1_540.png)_?
* Also, I get a warning with the Keywords Filter preview button:
* > Warning: Invalid argument supplied for foreach() in /…/wp-content/plugins/wp-
> pipes/controllers/pipe.php on line 517
Viewing 2 replies - 1 through 2 (of 2 total)
* Plugin Contributor [Tung Pham](https://wordpress.org/support/users/phamtungpth/)
* (@phamtungpth)
* [8 years, 6 months ago](https://wordpress.org/support/topic/po0-html-undefined/#post-9658092)
* Hi,
* Please do not worry about the “undefined” text! The main thing is the result
when you click Test buttons.
* About Keywords Filter, because the return result of that processor is only true
or false, so the preview button could not work. Maybe that is a bug, we will
try to check and update in next versions!
* Best Regards!
* Thread Starter [Tunn](https://wordpress.org/support/users/iuriem/)
* (@iuriem)
* [8 years, 6 months ago](https://wordpress.org/support/topic/po0-html-undefined/#post-9658421)
* Yes, the result is OK. Thank you!
Viewing 2 replies - 1 through 2 (of 2 total)
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* 2 replies
* 2 participants
* Last reply from: [Tunn](https://wordpress.org/support/users/iuriem/)
* Last activity: [8 years, 6 months ago](https://wordpress.org/support/topic/po0-html-undefined/#post-9658421)
* Status: resolved