404 error on Close

Under LS 5.6.10+230313 and plugin version 4.3.2, I click on Tools->Mail cron. I then click the red "Close" button. I receive message:

404: Not Found The system is unable to find the requested action "survey". The requested URL was not found on this server. If you entered the URL manually please check your spelling and try again.

Save and Save and close work correctly.