craching TG service on groups 2000 members

[zxcwe]

User deleted user#168453368 deleted
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SIGNAL received
h./tg/bin/telegram-cli(print_backtrace+0x20)[0x46edb0]
./tg/bin/telegram-cli(termination_signal_handler+0x64)[0x46ee34]
/lib/x86_64-linux-gnu/libc.so.6(+0x36d40)[0x7f9e3a8f8d40]
./tg/bin/telegram-cli(lua_contact_list_cb+0xb9)[0x483f09]
./tg/bin/telegram-cli[0x4a0a0d]
./tg/bin/telegram-cli(tglq_query_result+0x10f)[0x498bdf]
./tg/bin/telegram-cli[0x4914ca]
./tg/bin/telegram-cli[0x4b6a1b]
/usr/lib/x86_64-linux-gnu/libevent-2.0.so.5(event_base_loop+0x754)[0x7f9e3bd36f24]
./tg/bin/telegram-cli(net_loop+0xa6)[0x470336]
./tg/bin/telegram-cli(loop+0x187)[0x471637]
./tg/bin/telegram-cli(main+0x2e5)[0x46d615]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)[0x7f9e3a8e3ec5]
./tg/bin/telegram-cli[0x46d725]
so@ubuntu:~/TeleSeed$

whay??? :|