CWKPQ crashes channels

Describe the problem. Be as specific as possible!:
Whenever you press up on the portal to end Stage 4 in CWKPQ, the whole channel crashes.

 Images of problem

None at the moment... but we thought it was a fluke at first and tried another channel and lo and behold that crashed at the same point as well.

Interesting. Hope nobody remembers how to dupe items with this.

I also hope nobody releases the packet from this. That would be a really bad day.