From 954884ce0859a7d1d23ca6a66808d6bf5763de43 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ada=20Gottenstr=C3=A4ter?= <nunuu@gmx.net>
Date: Wed, 11 Dec 2024 15:15:28 +0100
Subject: [PATCH] Fix segfault in CheckSimpleIncrementLoop

---
 loops.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/loops.c b/loops.c
index fbfc7904b..07ea962b8 100644
--- a/loops.c
+++ b/loops.c
@@ -1050,12 +1050,13 @@ CheckSimpleIncrementLoop(AST *stmt)
     }
     
     /* check that the update is i++, and the variable is not used anywhere else */
-    while (update->kind == AST_SEQUENCE) {
+    while (update && update->kind == AST_SEQUENCE) {
         if (AstUsesName(update->right, updateVar)) {
             return;
         }
         update = update->left;
     }
+    if (!update) return;
     if (update->kind != AST_OPERATOR || update->d.ival != K_INCREMENT) {
         return;
     }