Not sure, could be related:
https://crash.limetech.org/qytbqpbmzm4z
Code:
0 sourcemod.2.l4d2.so!PlayerManager::OnClientDisconnect [PlayerManager.cpp:814 + 0x9]
1 sourcemod.2.l4d2.so!__SourceHook_FHCls_IServerGameClientsClientDisconnect0::CMyDelegateImpl::Call [FastDelegate.h:994 + 0x9]
2 sourcemod.2.l4d2.so!__SourceHook_FHCls_IServerGameClientsClientDisconnect0::Func [PlayerManager.cpp:70 + 0x13]
3 engine_srv.so!CGameServer::RemoveClientFromGame(CBaseClient*) + 0x5b
4 engine_srv.so!CGameClient::PerformDisconnection(char const*) + 0x10e
5 engine_srv.so!CBaseClient::Disconnect(char const*, ...) + 0x1d3
6 engine_srv.so!CGameClient::Disconnect(char const*, ...) + 0x54
7 engine_srv.so!kickid(CCommand const&) + 0x1f0
8 metamod.2.l4d2.so!__SourceHook_FHCls_ConCommandDispatchfalse::Func(CCommand const&) + 0xed
9 0xf7556d9c
However, none of my plugins use KickClientEx().