I stumbled upon a crash related to this line when using 17.7.2:

I noticed that the downstream logic changed somewhat in at version 17.7.3 but I think the original root cause wasn't remediated: while the code checks if core->interceptor is NULL it doesn't check if core->interceptor->interceptor (notice the additional indirection) is a valid pointer which will cause a NULL-adjacent access in gum_interceptor_begin_transaction: