1 files changed, 7 insertions, 1 deletions
diff --git a/vm.c b/vm.c
index 17f3c53ef5..18811f1196 100644
--- a/vm.c
+++ b/vm.c
@@ -44,7 +44,7 @@ rb_vm_search_cf_from_ep(const rb_thread_t * const th, rb_control_frame_t *cfp, c
 	    cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
 	}
 
-	rb_bug("rb_vm_search_cf_from_ep: no corresponding cfp");
+	return NULL;
     }
 }
 
@@ -1146,6 +1146,12 @@ vm_iter_break(rb_thread_t *th, VALUE val)
     VALUE *ep = VM_CF_PREV_EP(cfp);
     rb_control_frame_t *target_cfp = rb_vm_search_cf_from_ep(th, cfp, ep);
 
+#if 0				/* raise LocalJumpError */
+    if (!target_cfp) {
+	rb_vm_localjump_error("unexpected break", val, TAG_BREAK);
+    }
+#endif
+
     th->state = TAG_BREAK;
     th->errinfo = (VALUE)NEW_THROW_OBJECT(val, (VALUE)target_cfp, TAG_BREAK);
     TH_JUMP_TAG(th, TAG_BREAK);