Panic alert

[marvin alcantara]

Hi,

I am getting a panic alert when sending an email in my box.  Below is the backtrace:
/usr/lib64/dovecot/libdovecot.so.0(+0x9f3de) [0x7fa90b5543de] -> /usr/lib64/dovecot/libdovecot.so.0(+0x9f4be) [0x7fa90b5544be] -> /usr/lib64/dovecot/libdovecot.so.0(i_fatal+0) [0x7fa90b4e577c] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_search_args_unref+0xa2) [0x7fa90b827c82] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_search_result_free+0x7a) [0x7fa90b84029a] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_thread_init+0x128) [0x7fa90b8b2e88] -> /usr/lib64/dovecot/libdovecot-storage.so.0(index_storage_search_init+0x471) [0x7fa90b8a78a1] -> /usr/lib64/dovecot/lib20_virtual_plugin.so(virtual_search_init+0x23) [0x7fa90a0ac3d3] -> /usr/lib64/dovecot/libdovecot-storage.so.0(index_search_result_update_flags+0x11f) [0x7fa90b8a4f8f] -> /usr/lib64/dovecot/libdovecot-storage.so.0(index_sync_search_results_update+0x5b) [0x7fa90b8afe9b] -> /usr/lib64/dovecot/libdovecot-storage.so.0(index_mailbox_sync_deinit+0x1a4) [0x7fa90b8b0724] -> /usr/lib64/dovecot/libdovecot-storage.so.0(+0xaa03f) [0x7fa90b89103f] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_sync_deinit+0x38) [0x7fa90b830cb8] -> dovecot/imap(+0x27111) [0x564ec6db6111] -> dovecot/imap(imap_sync_more+0x10d) [0x564ec6db6ccd] -> dovecot/imap(+0x28356) [0x564ec6db7356] -> dovecot/imap(cmd_sync_delayed+0x1f4) [0x564ec6db7814] -> dovecot/imap(client_handle_input+0x218) [0x564ec6daa968] -> dovecot/imap(client_input+0x85) [0x564ec6daae05] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x52) [0x7fa90b569cd2] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x10f) [0x7fa90b56b3bf] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x3c) [0x7fa90b569d6c] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7fa90b569f28] -> /usr/lib64/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7fa90b4effa3] -> dovecot/imap(main+0x333) [0x564ec6d9d2e3] -> /lib64/libc.so.6(__libc_start_main+0xf5) [0x7fa90b10a445] -> dovecot/imap(+0xe476) [0x564ec6d9d476]

Dovecot version: 2.2.33.2
I would like to ask help on what is happening here. I found in the code that the trigger is in plugins/virtual/virtual-sync.c virtual_sync() call. When does this actually being called? 
Thank you very much!
Regards,Marvin Alcantara
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