Title: Warning: Undefined array key
Last modified: September 19, 2023

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# Warning: Undefined array key

 *  Resolved [Branike](https://wordpress.org/support/users/branike/)
 * (@branike)
 * [2 years, 8 months ago](https://wordpress.org/support/topic/warning-undefined-array-key-22/)
 * Warning: Undefined array key “theme_lists_show” in /wp-content/plugins/newsletter-
   leads/iframe.php on line 18
 * Hi, I get this message from a popup form. I saw it on many sites that have it.
   Any advice to fix the problem?
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fwarning-undefined-array-key-22%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Plugin Author [Stefano Lissa](https://wordpress.org/support/users/satollo/)
 * (@satollo)
 * [2 years, 8 months ago](https://wordpress.org/support/topic/warning-undefined-array-key-22/#post-17061775)
 * Hi, this is not an error from the Newsletter plugin but from a commercial addon(
   Leads). Please, ask for support on [http://www.thenewsletterplugin.com](http://www.thenewsletterplugin.com).
 * Thank you!

Viewing 1 replies (of 1 total)

The topic ‘Warning: Undefined array key’ is closed to new replies.

 * ![](https://ps.w.org/newsletter/assets/icon-256x256.png?rev=1052028)
 * [Newsletter - Send awesome emails from WordPress](https://wordpress.org/plugins/newsletter/)
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 * [Unresolved Topics](https://wordpress.org/support/plugin/newsletter/unresolved/)
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 * 1 reply
 * 2 participants
 * Last reply from: [Stefano Lissa](https://wordpress.org/support/users/satollo/)
 * Last activity: [2 years, 8 months ago](https://wordpress.org/support/topic/warning-undefined-array-key-22/#post-17061775)
 * Status: resolved