strange error with CTF mode of GamesOpenArena

the server is not available after this error :
I did not find significant links for ERROR: NULL ent->think by googling though :/

trying to load maps/cbctf1.aas
loaded maps/cbctf1.aas
found 35 level items
-------------------------------------
6 bots parsed
7 arenas parsed
AAS initialized.
ClientConnect: 0
ClientUserinfoChanged: 0 n\UnnamedPlayer\t\3\model\james\hmodel\*james\g_redteam\\g_blueteam\\c1\4\c2\5\hc\100\w\0\l\0\tt\0\tl\0
-----------------------------------
Sending heartbeat to dpmaster.deathmask.net
broadcast: print "UnnamedPlayer^7 disconnected\n"
ClientDisconnect: 0
Sending heartbeat to dpmaster.deathmask.net
********************
ERROR: NULL ent->think
********************
----- Server Shutdown (Server crashed: NULL ent->think) -----
Sending heartbeat to dpmaster.deathmask.net
Sending heartbeat to dpmaster.deathmask.net
==== ShutdownGame ====
ShutdownGame:
------------------------------------------------------------
AAS shutdown.
Closed log botlib.log
---------------------------

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