1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/tree.c b/gcc/tree.c
index 82b00e7..1ec2976 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -2469,6 +2469,10 @@ unsave_expr_now_r (expr)
 {
   enum tree_code code;
 
+  /* There's nothing to do for NULL_TREE.  */
+  if (!expr)
+    return;
+
   unsave_expr_1 (expr);
 
   code = TREE_CODE (expr);