mruby-eval instance_eval segfaults on rescue

[IceDragon200]

Current mruby head: 4cc9e5d
In the following code:

begin
  instance_eval("a")
rescue Exception
end

instance_eval will cause a mruby segfault with a rescue block.
Removing the rescue block will have the code work as expected.

This only occurs with the mruby-eval extension installed.

Example & Backtrace:

mirb - Embeddable Interactive Ruby Shell

> begin
* instance_eval("a")
* rescue Exception
* end

Program received signal SIGSEGV, Segmentation fault.
0x0000000000404aed in mrb_context_run (mrb=0x0, mrb@entry=0x6c2010, proc=0x2, proc@entry=0x70a4f0, self=..., stack_keep=7160192, stack_keep@entry=0)
    at /home/icy/docs/codes/archSeer/moon/vendor/mruby/src/vm.c:774
774       NEXT;
(gdb) backtrace
#0  0x0000000000404aed in mrb_context_run (mrb=0x0, mrb@entry=0x6c2010, proc=0x2, proc@entry=0x70a4f0, self=..., stack_keep=7160192, stack_keep@entry=0)
    at /home/icy/docs/codes/archSeer/moon/vendor/mruby/src/vm.c:774
#1  0x0000000000403b3d in main (argc=<optimized out>, argv=<optimized out>)
    at /home/icy/docs/codes/archSeer/moon/vendor/mruby/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c:414
(gdb)