Thanks for reporting this — this crash has been reported before, and is currently under investigation. The issue is data dependent (i.e. it only occurs for some projects) and I have so far been unable to reproduce it locally.
It seems that the crash occurs in the UnusedErrorValue rule, so a workaround would be to simply exclude that rule until the issue is fixed.
Ali Rantakarirepo owner
Version 1.5 uses a newer version of the Clang compiler — please check if this crash still occurs with that.