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The add menu stopped working in WordPress Menus and the offending plugin is WHA Crossword
The error is line 43 in crossword-admin.js
var useGlobalOptions = crossword_vars_admin.use_global_options;
The full console error is…
crossword-admin.js?ver=1.0:43 Uncaught ReferenceError: crossword_vars_admin is not defined
at HTMLDocument.<anonymous> (crossword-admin.js?ver=1.0:43)
at i (load-scripts.php?c=0&load[chunk_0]=jquery-core,utils&ver=5.5.1:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load[chunk_0]=jquery-core,utils&ver=5.5.1:2)
at Function.ready (load-scripts.php?c=0&load[chunk_0]=jquery-core,utils&ver=5.5.1:2)
at HTMLDocument.J (load-scripts.php?c=0&load[chunk_0]=jquery-core,utils&ver=5.5.1:2)
Thought I would post this here in case anyone else is having similar problems.
By deactivating the plugin the add menu will work again.