Title: Fatal Errors while Sending
Last modified: December 5, 2025

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# Fatal Errors while Sending

 *  Resolved [Frank](https://wordpress.org/support/users/t-mug/)
 * (@t-mug)
 * [6 months ago](https://wordpress.org/support/topic/fatal-errors-while-sending/)
 * **Tons of messages like this (created during otherwise successful sending) in
   error.log:**
 * +[05-Dec-2025 21:02:09 UTC] PHP Fatal error: Uncaught Error: Class “FluentCampaignAppModelsSequenceTracker”
   not found in /www/wp-content/plugins/fluent-crm/app/Hooks/Handlers/Cleanup.php:
   113
   +Stack trace:+#0 /www/wp-includes/class-wp-hook.php(343): FluentCrmAppHooksHandlersCleanup-
   >handleUnsubscribe(Object(FluentCrmAppModelsSubscriber))+#1 /www/wp-includes/
   class-wp-hook.php(365): WP_Hook->apply_filters(”, Array)+#2 /www/wp-includes/
   plugin.php(522): WP_Hook->do_action(Array)+#3 /www/wp-content/plugins/fluent-
   crm/app/Models/Subscriber.php(2431): do_action(‘fluentcrm_subsc…’, Object(FluentCrmAppModelsSubscriber),‘
   subscribed’)+#4 /www/wp-content/plugins/fluent-crm/app/Hooks/Handlers/ExternalPages.
   php(185): FluentCrmAppModelsSubscriber->updateStatus(‘bounced’)+#5 /www/wp-content/
   plugins/fluent-crm/app/Hooks/Handlers/ExternalPages.php(139): FluentCrmAppHooksHandlersExternalPages-
   >recordUnsubscribe(Array)+#6 /www/wp-content/plugins/fluent-crm/app/Hooks/Handlers/
   ExternalPages.php(77): FluentCrmAppHooksHandlersExternalPages->bounceHandlerSES()
   +#7 /www/wp-content/plugins/fluent-crm/app/Hooks/Handlers/ExternalPages.php(68):
   FluentCrmAppHooksHandlersExternalPages->bounceHandler()+#8 /www/wp-includes/class-
   wp-hook.php(341): FluentCrmAppHooksHandlersExternalPages->route(”)+#9 /www/wp-
   includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array)+#10 /www/
   wp-includes/plugin.php(522): WP_Hook->do_action(Array)+#11 /www/wp-settings.php(
   742): do_action(‘init’)+#12 /www/wp-config.php(91): require_once(‘/www/wp-content/…’)
   +#13 /www/wp-load.php(50): require_once(‘/www/wp-content/…’)+#14 /www/wp-blog-
   header.php(13): require_once(‘/www/wp-content/…’)+#15 /www/index.php(17): require(‘/
   www/wp-content/…’)+#16 {main}
    - thrown in /www/wp-content/plugins/fluent-crm/app/Hooks/Handlers/Cleanup.php
      on line 113
      +[05-Dec-2025 21:02:09 UTC] OK+[05-Dec-2025 21:02:09 UTC] OK+[
      05-Dec-2025 21:02:11 UTC] PHP Fatal error: …** and so on**
 * It’s the most recent wp.org version of the plugin. We use Amazon SES. How to 
   debug this?

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

 *  Thread Starter [Frank](https://wordpress.org/support/users/t-mug/)
 * (@t-mug)
 * [6 months ago](https://wordpress.org/support/topic/fatal-errors-while-sending/#post-18745811)
 * That was my mistake, sorry.
 *  Plugin Support [Ibrahim Sharif](https://wordpress.org/support/users/ibrahimsharif/)
 * (@ibrahimsharif)
 * [2 months, 3 weeks ago](https://wordpress.org/support/topic/fatal-errors-while-sending/#post-18856079)
 * Hello [@t-mug](https://wordpress.org/support/users/t-mug/),
 * I hope you’re having a delightful day!
 * I’m checking in on your recent ticket concerning ‘Fatal Errors while Sending’
   within FluentCRM. I noticed your kind follow-up message where you mentioned, “
   That was my mistake, sorry.” and I’m absolutely thrilled to see that you’ve already
   indicated the issue is resolved on your end!
 * It’s wonderful news that everything is back on track for you. We understand that
   sometimes things can be a bit tricky, and we’re always here to ensure your experience
   with FluentCRM is as smooth as possible.
 * Wishing you continued success and smooth operations with FluentCRM!

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

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 * 2 replies
 * 2 participants
 * Last reply from: [Ibrahim Sharif](https://wordpress.org/support/users/ibrahimsharif/)
 * Last activity: [2 months, 3 weeks ago](https://wordpress.org/support/topic/fatal-errors-while-sending/#post-18856079)
 * Status: resolved