Title: UNDEFINED – Notification error
Last modified: May 5, 2021

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# UNDEFINED – Notification error

 *  Resolved [gianlucal](https://wordpress.org/support/users/gianlucal/)
 * (@gianlucal)
 * [5 years ago](https://wordpress.org/support/topic/undefined-notification-error/)
 * Hi, we are trying to use your plugin. However, when we send the notifications,
   we get an “UNDEFINED error” instead of the “normal” push message.
 * SUPPORT
    We have been trying to contact your support without luck.
 * Can you please help?
 * Thanks
    -  This topic was modified 5 years ago by [gianlucal](https://wordpress.org/support/users/gianlucal/).

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

 *  Plugin Author [webpushr](https://wordpress.org/support/users/webpushr/)
 * (@webpushr)
 * [5 years ago](https://wordpress.org/support/topic/undefined-notification-error/#post-14401454)
 * Hi there,
 * Yes we received your e-mail and we are looking into this. We apologize for the
   delayed response.
 * Thanks you for your patience.
 *  Plugin Author [webpushr](https://wordpress.org/support/users/webpushr/)
 * (@webpushr)
 * [5 years ago](https://wordpress.org/support/topic/undefined-notification-error/#post-14401577)
 * We just responded back to your e-mail. You have installed a PWA plugin that is
   creating conflict with our plugin. Keep in mind that only one service worker 
   file can be activated per domain and since your PWA plugin is also attempting
   to register a service worker file, it is causing conflict.

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

The topic ‘UNDEFINED – Notification error’ is closed to new replies.

 * ![](https://ps.w.org/webpushr-web-push-notifications/assets/icon.svg?rev=2183418)
 * [Web Push Notifications - Webpushr](https://wordpress.org/plugins/webpushr-web-push-notifications/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/webpushr-web-push-notifications/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/webpushr-web-push-notifications/)
 * [Active Topics](https://wordpress.org/support/plugin/webpushr-web-push-notifications/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/webpushr-web-push-notifications/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/webpushr-web-push-notifications/reviews/)

 * 2 replies
 * 2 participants
 * Last reply from: [webpushr](https://wordpress.org/support/users/webpushr/)
 * Last activity: [5 years ago](https://wordpress.org/support/topic/undefined-notification-error/#post-14401577)
 * Status: resolved