1 files changed, 2 insertions, 2 deletions
diff --git a/vm.c b/vm.c
index f249585dba..dd216bd048 100644
--- a/vm.c
+++ b/vm.c
@@ -787,9 +787,9 @@ rb_vm_cref(void)
     rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(th, th->cfp);
 
     if (cfp == 0) {
-	rb_raise(rb_eRuntimeError, "Can't call on top of Fiber or Thread");
+	return NULL;
     }
-    return vm_get_cref(cfp->iseq, cfp->ep);
+    return rb_vm_get_cref(cfp->iseq, cfp->ep);
 }
 
 #if 0