[SKCropNode setMaskNode:] crash, any idea? Help!

[SKCropNode setMaskNode:] crash, any idea? Help!
Crashed: com.apple.main-thread

EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x000000012e8067b0

0  SpriteKit                      0x62d2c SKCCropNode::setMaskNode(SKCNode*) + 8

1  SpriteKit                      0xa0854 -[SKCropNode setMaskNode:] + 88
[SKCropNode setMaskNode:] crash, any idea? Help!
 
 
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