Thank you for your quick response. This error actually occurs when the page loads for editing. Here are the console error messages:
JQMIGRATE: Migrate is installed, version 1.4.1
Failed to load resource: the server responded with a status of 500 (Internal Server Error)
onloadwff.js:71 [Violation] ‘setTimeout’ handler took 52ms
[Violation] Forced reflow while executing JavaScript took 40ms
lodash.min.js?ver=4.17.11:68 [Violation] ‘setTimeout’ handler took 73ms
Robert