GameServer auto exit with no reason

Hi guys,

I really need help because sometime, my SR_GameServer is closed automatically, here is the fatal log

Quote:

2016-11-20 21:53:38 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12056 / 12424)
2016-11-20 22:00:40 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12059 / 12423)
2016-11-20 22:10:45 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12056 / 12428)
2016-11-20 22:14:54 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12033 / 12248)
2016-11-20 22:17:36 [SR_GameServer] Unique Monster Entered! UNIQUE[MOB_KK_ISYUTARU] POS[rid:22139 (591.33,1938.26,1527.55)]
2016-11-20 22:18:34 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12056 / 12427)
2016-11-20 22:31:11 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12059 / 12435)
2016-11-20 22:40:49 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12033 / 12417)
2016-11-20 22:42:55 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12056 / 12431)
2016-11-20 22:43:16 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12033 / 12418)
2016-11-20 22:48:53 [SR_GameServer] Unique Monster Killed! UNIQUE[MOB_KK_ISYUTARU] by [GKT]
2016-11-20 22:51:28 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12059 / 12449)
2016-11-20 22:55:50 [SR_GameServer] unknown packet sender detected!!! will be disconnected (char_name: BinBeo91)
2016-11-20 23:00:28 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12033 / 12114)
2016-11-20 23:06:14 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12033 / 12296)
2016-11-20 23:12:23 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12059 / 12458)
2016-11-20 23:14:59 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12028 / 12448)
2016-11-20 23:20:27 [SR_GameServer] CTrainingCamp::MemberGraduated Mentor's ExpBuff Deactivate Failed!! (12028 / 12450)
2016-11-20 23:22:57 [SR_GameServer] OnExit() Called

Please help.