did a traceback, but it didnt help it think

, everything is compiled with --enable-debug, any suggestions?
MovePlayerTo:
Setting position of player -172.545975 -11.988600 -4.340508
include/csutil/blockallocator.h:188: failed assertion \'blocks.firstfree == (csFreeList*)blocks.memory\'
Program received signal SIGTRAP, Trace/breakpoint trap.
[Switching to Thread 16384 (LWP 27848)]
0x4d3d0b65 in ?? ()
(gdb) backtrace
#0 0x4d3d0b65 in ?? ()
#1 0x082b8148 in ?? ()