Kopano Server "Fatal error" that causes the server to stop

Hi,

Today the Kopano server crashed twice. I found the following information in the log file.
Any suggestions?

Sat Jul 14 09:56:36 2018: [crit   ] Fatal error detected. Please report all following information.
Sat Jul 14 09:56:36 2018: [crit   ] Application kopano-server version: 8.6.80
Sat Jul 14 09:56:36 2018: [crit   ] OS: Linux, release: 4.4.0-130-generic, version: #156-Ubuntu SMP Thu Jun 14 08:53:28 UTC 2018, hardware: x86_64
Sat Jul 14 09:56:36 2018: [crit   ] Thread name: z-s:
Sat Jul 14 09:56:36 2018: [crit   ] Peak RSS: 800484
Sat Jul 14 09:56:36 2018: [crit   ] Pid 5398 caught SIGSEGV (11), traceback:
Sat Jul 14 09:56:36 2018: [crit   ] Backtrace:
Sat Jul 14 09:56:36 2018: [crit   ] #0. /usr/lib/libkcutil.so.0(+0x46ed0) [0x7f031a801ed0]
Sat Jul 14 09:56:36 2018: [crit   ] #1. /usr/lib/libkcutil.so.0(+0x361cd) [0x7f031a7f11cd]
Sat Jul 14 09:56:36 2018: [crit   ] #2. /usr/lib/libkcutil.so.0(_ZN2KC23generic_sigsegv_handlerEPNS_8ECLoggerEPKcS3_iPK9siginfo_tPKv+0x1bd) [0x7f031a7f149d]
Sat Jul 14 09:56:36 2018: [crit   ] #3. /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390) [0x7f03185d6390]
Sat Jul 14 09:56:36 2018: [crit   ] #4. /usr/lib/libkcsoap.so.0(_ZN2KC19DynamicPropValArray15GetPropValArrayEP12propValArrayb+0) [0x7f031a17c6f0]
Sat Jul 14 09:56:36 2018: [crit   ] #5. /usr/lib/libkcserver.so.0(+0x15612b) [0x7f031a51f12b]
Sat Jul 14 09:56:36 2018: [crit   ] #6. /usr/lib/libkcserver.so.0(+0x1565e9) [0x7f031a51f5e9]
Sat Jul 14 09:56:36 2018: [crit   ] #7. /usr/lib/libkcserver.so.0(_ZN11KCmdService10loadObjectEmRK17xsd__base64BinaryP15notifySubscribejP18loadObjectResponse+0x684) [0x7f031a520274]
Sat Jul 14 09:56:36 2018: [crit   ] #8. /usr/lib/libkcserver.so.0(+0x198d50) [0x7f031a561d50]
Sat Jul 14 09:56:36 2018: [crit   ] #9. /usr/lib/libkcserver.so.0(_ZN11KCmdService8dispatchEP4soap+0x1e49) [0x7f031a563fd9]
Sat Jul 14 09:56:36 2018: [crit   ] #10. /usr/sbin/kopano-server() [0x41106e]
Sat Jul 14 09:56:36 2018: [crit   ] #11. /lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba) [0x7f03185cc6ba]
Sat Jul 14 09:56:36 2018: [crit   ] #12. /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7f0317d6a41d]
Sat Jul 14 09:56:36 2018: [crit   ] Signal errno: Success, signal code: 1
Sat Jul 14 09:56:36 2018: [crit   ] Sender pid: 26, sender uid: 0, si_status: 183976096
Sat Jul 14 09:56:36 2018: [crit   ] Signal value: 183976096, faulting address: 0x1a
Sat Jul 14 09:56:36 2018: [crit   ] When reporting this traceback, please include Linux distribution name (and version), system architecture and Kopano version.

The server is version 8.6.80 and is running at Ubuntu 16.04 64 bit.
I started kopana-search today. I realised this hasn’t started before as the required phyton packages were missing.

If anybody has an idea what I could do to avoid this problem in the future I would be thankful.

Are you running the latest nightly?