Error when searching in mailfolders

[Christoph Pleger]

Hello,

>>> Lucene library is throwing an error, which crashes Dovecot. Maybe Dovecot
>>> should catch the error, but it would still be broken. Try deleting the
lucene indexes and rebuilding them?
>> Deleting the indexes helped, but after they had been rebuilt, the error
occurred again.

> Could you enable core dumps and run bt full in gdb?

I attached the result.

Regards
  Christoph
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