thanks! finally I found the file which cause the bug - it's not knight, it's id 400 which include one knight pic - the golden knight standing around 
ok, will look how to fix now...
edit: yipppie yah yeah, great this is fixed.
The zero placer / placefinder used the same level as the itr in crouch frames used to "open" the ground in stage 1-1 (the prison brake
) - well, no wonder it happened sometimes - this itr is very limited so the bug only happened if you jump and you stand on top (z-axis) of the level - and this bug could happen everytime when you use the zero placer - so good it's fixed now

ok, will look how to fix now...
edit: yipppie yah yeah, great this is fixed.
The zero placer / placefinder used the same level as the itr in crouch frames used to "open" the ground in stage 1-1 (the prison brake


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