1 files changed, 3 insertions, 1 deletions
diff --git a/eval_jump.c b/eval_jump.c
index dbc3794a59..f3eb30fc56 100644
--- a/eval_jump.c
+++ b/eval_jump.c
@@ -107,10 +107,12 @@ rb_f_catch(int argc, VALUE *argv)
     rb_thread_t *th = GET_THREAD();
     rb_control_frame_t *saved_cfp = th->cfp;
 
-    rb_scan_args(argc, argv, "01", &tag);
     if (argc == 0) {
 	tag = rb_obj_alloc(rb_cObject);
     }
+    else {
+	rb_scan_args(argc, argv, "01", &tag);
+    }
     PUSH_TAG();
 
     th->tag->tag = tag;