Since this sounds Fl_Tree related, thought I'd look into this.

I was able to build the app you provided, but it won't load any valid PNG files I browse to.
The app is too large to use as a simple debugging tool; I'm not sure what the app is supposed to do, or what the tree is used for.

OP, please reduce the problem to a simple one-file program.
If it's tree related, start with one of the simple tree examples (in examples/treecxx) and add code to it that demonstrates the crash.

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