`method_missing` might have updated stack beyond boundary; fix #3599

1 files changed, 1 insertions, 0 deletions

diff --git a/src/vm.c b/src/vm.c
index 3466e89db..05ab15e1c 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -395,6 +395,7 @@ mrb_funcall_with_block(mrb_state *mrb, mrb_value self, mrb_sym mid, mrb_int argc
         mrb_method_missing(mrb, mid, self, args);
       }
       mrb_ary_unshift(mrb, args, mrb_symbol_value(mid));
+      stack_extend(mrb, n+2);
       mrb->c->stack[n+1] = args;
       argc = -1;
     }