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FluentCRM

#Bug Report

FluentCRM Campaign Sending Stops Until wp action-scheduler run Is Triggered Manually

Hi. We are experiencing an issue with FluentCRM campaign sending after the latest update.

Environment:

  • WooCommerce
  • BuddyBoss
  • MemberPress
  • Fluent Forms
  • Redis Object Cache
  • Cloudflare Pro
  • WP-CLI cron (real server cron every minute)
  • Action Scheduler is working correctly

What happens:

  • Test emails are sent correctly
  • The campaign starts sending
  • Then it stops/hangs
  • If we manually run:
    wp action-scheduler run
    the campaign immediately continues sending again

We confirmed:

  • WP Cron is working
  • Action Scheduler is processing tasks
  • No PHP memory or execution issues
  • SMTP is working
  • Cloudflare WAF should not be an issue

We also noticed actions like:
fluent_crm_send_multi_thread_emails

Question:
Could this be related to the latest FluentCRM update, or to the multi-thread email queue system not properly rescheduling batches automatically?

Has anyone else experienced campaigns stopping unless Action Scheduler is manually triggered?

Cheers

  • 1 like
  • 5 comments

Natascha Vantuykom

Arild Bekkelund did you setup server cron? https://fluentcrm.com/docs/replace-wordpress-cron-with-a-real-cron-job/

Arild Bekkelund

Natascha Vantuykom 

Yes, server cron is running.

David Risley

Two things:

#1 - Yes, make sure you have WP CRON disabled and you're using server-based CRON instead. More reliable.

#2 - I've seen this happen before, too, when people are running a lot of plugins. Reason seems to be that the firing order of plugins and WP core being loaded up when the scheduled task is actually run could potentially put FluentCRM past your memory threshold. The WP front-end has a different memory limit than the backend. If I recall, it defaults to like 40MB. And if you have a lot other plugins that load up and try to do things, it can mean FluentCRM never gets executed for scheduled tasks. Solution is to raise the memory limit in wp-config. Using WP_MEMORY_LIMIT

Arild Bekkelund

Thanks for the suggestion. Our site runs on a dedicated server with ample memory, so I’m fairly confident the issue isn’t related to basic server configuration. We’ve been running this server since October 2024 and have successfully sent weekly campaigns to our community without any issues — until now.
That’s what leads me to suspect the latest FCRM update may be the culprit. I plan to roll back to a previous version on our staging server tomorrow to test that theory, and I’ll report back with the results.

David Risley

Arild Bekkelund It is indeed possible. But, keep in mind, the server having a lot of memory doesn't have much to do with the memory limits that WordPress uses. They are 2 different things.