[Reportbug-maint] Bug#758619: reportbug fails with Attempt to unlock mutex that was not locked

[Jan Binder]

Package: reportbug
Version: 6.5.0+nmu1
Severity: grave

reportbug just aborts with exit code 134 when it is started.

$ reportbug
Please enter the name of the package in which you have found a problem, or 
type 'other' to report a more general problem.
> Attempt to unlock mutex that was not locked
zsh: abort      reportbug