1 files changed, 1 insertions, 0 deletions
diff --git a/parse.y b/parse.y
index fb471803a5..3763dabf3a 100644
--- a/parse.y
+++ b/parse.y
@@ -9962,6 +9962,7 @@ static NODE *
 arg_blk_pass(NODE *node1, NODE *node2)
 {
     if (node2) {
+        if (!node1) return node2;
 	node2->nd_head = node1;
 	nd_set_first_lineno(node2, nd_first_lineno(node1));
 	nd_set_first_column(node2, nd_first_column(node1));