Has anyone run into this issue that seems to be happening in tree.diffIndex? It happens sporadically -- it seems to occur during garbage collection. My app crashes with:

node(16403,0x7fff77c61310) malloc: 
*** error for object 0x100d05720: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

I am not sure how to get any more information beyond this. Tried searching for malloc_error_break to try to insert a breakpoint but I am not seeing it.