PHP errors were triggered during an Ajax request (Query Monitor).

[kawsarahmedr]

Describe the bug
PHP errors were triggered during an Ajax request. Please have a look at your browser developer console for details.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Campaign edit screen'
2. Click on 'Run Campaign'
3. If the campaign found an article then the Ajax issue was found by the plugin "Query Monitor".
4. See error

Screenshots