[Dovecot] 2.0 beta4 latest hg: segfault with virtual plugin

[e-frog]

Hello Timo,

latest 2.0 hg version (changeset a6b050cc4a9a) segfaults when selecting
a virtual mailbox. Backtrace and dovecot -n are attached.

Please let me know if I can help with anything else to debug this.

Regards,
e-frog
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