1 files changed, 1 insertions, 1 deletions
diff --git a/eval.c b/eval.c
index b2e2d63074..6d8b1a5a7b 100644
--- a/eval.c
+++ b/eval.c
@@ -5919,7 +5919,7 @@ proc_call(proc, args)
     PUSH_ITER(ITER_CUR);
     ruby_frame->iter = ITER_CUR;
 
-    if (TYPE(args) == T_ARRAY) {
+    if (args != Qundef && TYPE(args) == T_ARRAY) {
 	args = callargs(args);
     }