Question whirlwind crashed mud

hmm tryed to use the skill whirlwind on a warrior, stock tbamud 3.64 only added more levels.
First time use:
the char made the whirlwind, mob died and then mud crashed.

after restart when the warrior whirlwinds now it dont crash but:
Imp standing next to the warrior see this message:
<NULL> begins to rapidly spin in a circle!

Syslog:
My imp receives this message upon warriors whirlwind:

WARNING: Attempting to merge iterator to empty list.
WARNING: Attempting to remove iterator from NULL list.
WARNING: Attempting to merge iterator to empty list.
WARNING: Attempting to remove iterator from NULL list.
WARNING: Attempting to merge iterator to empty list.
WARNING: Attempting to remove iterator from NULL list.

Anyone please write how to fix this

The "<NULL> begins to rapidly spin in a circle!" was caused by an "$N" as opposed to an "$n", the fix was uploaded to the SVN.

The other issue I couldn't duplicate, so I'll need some more info on how it is occurring.

My imp has syslog all on and every time the Warrior begins the whirlwind skill i get those 6 Lines on screen

Where do i find SVR ?

It is generally really hard (for me) to figure out a crash problem unless a gdb output is printed out...