Null pointer dereference in OP_ENTER

PoC === The following demonstrates a crash: class A def foo end end class B < A def foo(*args) super(*args, &:b) end end B.new.foo Debug info ========== The null pointer dereference happens in vm.c:1572 in both mruby and mruby-engine: 1570│ if (argc < 0) { 1571│ struct RArray *ary = mrb_ary_ptr(regs[1]); 1572├> argv = ary->ptr; (gdb) p ary $1 = (struct RArray *) 0x0 Test platform ============= * Linux Mint 17.3 (Cinnamon 64-bit), built with gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3 mruby SHA: a14a930c800aa50a191922580d53a2ce09287912 mruby-engine SHA: 09be20e67888b20bebf9b0588bc3cbec7f55325f Thank you, Dinko Galetic Denis Kasak