From 3584c4c87fceb3771daaa054de1eed75ebc46b86 Mon Sep 17 00:00:00 2001
From: bbbradsmith <bbbradsmith@users.noreply.github.com>
Date: Mon, 22 Feb 2021 11:57:32 -0500
Subject: [PATCH] fix crash when a NULL ExprNode is checked for circular
 references

---
 src/ld65/expr.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/ld65/expr.c b/src/ld65/expr.c
index bc3d7941c..e106e09d0 100644
--- a/src/ld65/expr.c
+++ b/src/ld65/expr.c
@@ -464,6 +464,12 @@ static void GetSegExprValInternal (ExprNode* Expr, SegExprDesc* D, int Sign)
 {
     Export* E;
 
+    if (Expr == 0)
+    {
+        D->TooComplex = 1;
+        return;
+    }
+
     switch (Expr->Op) {
 
         case EXPR_LITERAL: