This should tell us a bit more I think.
Code:
Core was generated by `./world'.
Program terminated with signal 11, Segmentation fault.
#0 0x0055efbb in ____strtol_l_internal () from /lib/libc.so.6
(gdb) bt
#0 0x0055efbb in ____strtol_l_internal () from /lib/libc.so.6
#1 0x0055ed1f in __strtol_internal () from /lib/libc.so.6
#2 0x08097faa in Database::GetCharInstZOrgID (this=0x816e1c4, charID=1) at /usr/include/stdlib.h:336
#3 0x0809c004 in Database::GetInstZoneID (this=0x816e1c4, zoneID=189, charName=0x9ad989c "Cetin")
at ../common/database.cpp:2345
#4 0x0807aada in Client::EnterWorld (this=0x9ad9890, TryBootup=true) at client.cpp:685
#5 0x0807c773 in Client::HandlePacket (this=0x9ad9890, app=0x9ad9da8) at client.cpp:583
#6 0x0807ca31 in Client::Process (this=0x9ad9890) at client.cpp:654
#7 0x080d9ac6 in ClientList::Process (this=0x816d540) at clientlist.cpp:59
#8 0x0807ffe3 in main (argc=Cannot access memory at address 0x0
) at net.cpp:390
(gdb)