Getting error "libobjc.A.dylib`objc_assign_strongCast_non_gc(objc_object*, objc_object**)"

Question

I have a huge set of data, those are displayed in a customized NSOutlineView.

Sometime my app gets crashed and gives me this error, while running in Xcode:

libobjc.A.dylibobjc_assign_strongCast_non_gc(objc_object*, objc_object**)`

Any idea about this one? Your replies would certainly help me to figure it out.

EDIT:

What I have tried so far:

I have put all exception breakpoints and enabled NSZombieEnabled. But is never caught.

I have use Binding to populate the NSOutlineView. The array contains one custom object, and the gets its values from aync server calls. If I do not open this NSOutlineView window, then every thing goes well.