demos/monkey: Fixed a segmentation fault.
demos/monkey: Fixed a segmentation fault.

Spamming mouse/touch events can cause Threepwood's
animation node to be removed twice.

tn0502/rainbow,pandaforks/tido-rainbow,pandaforks/tido-rainbow,tn0502/rainbow,pandaforks/tido-rainbow,tn0502/rainbow,tn0502/rainbow,tn0502/rainbow,tn0502/rainbow,pandaforks/tido-rainbow,pandaforks/tido-rainbow