Error in further invocations of --cache

[bezirg]

In our repository at https://github.com/IntersectMBO/plutus , trying

$ hasktags --cache -e .

generates successfully the TAGS file and all the cached *.tags files.

However, subsequent invocations of the same command throw with the error:

$ hasktags --cache -e .
hasktags: fromJSON: field does not exist _fileName
CallStack (from HasCallStack):
  error, called at ./Text/JSON/Generic.hs:195:22 in json-0.11-c942161d8d1ba958e8153443da1946939170e9e5ea1a1a82d904bcdc45475d47:Text.JSON.Generic

Either this is a bug or I am using the --cache option wrong. The same error happens irrespective of the tags format (-c , -x or -e)