The 1088 "index is invalid or missing' error can be observed in v14 if you try to add/modify records in a table that has a field that was recently marked as Unique (or Primary Key) but the database has not yet been restarted.



This error in v14 is generated for the same reasons it is generated in v13, however, v14 has a feature that will automatically index the unique field(s) upon database startup.

So if you are seeing this error in v14+ all you should need to do is restart the database.