Quote:
Originally Posted by Comfy.n
Nice, anyway I'm attaching the metadata.db from a portable install (Calibre 6.5, Windows 10), in which the same behaviour was reproduced
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Thanks. The problem arises because you used a "behaves like tags" column type. The search code does fail in this case because it doesn't check tags-like columns for empty.
You can fix it by changing the column type to "column built from other columns". This is what it should be, because it cannot contain multiple values.
In any event I will fix calibre.