From e675ddc6b9562871c3a49fc3bc2a5145abf9d6d8 Mon Sep 17 00:00:00 2001
From: Ye Kuang <k-ye@users.noreply.github.com>
Date: Tue, 12 Apr 2022 19:45:48 +0800
Subject: [PATCH] [autodiff] Fix nullptr during adjoint codegen (#4771)

---
 taichi/transforms/auto_diff.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/taichi/transforms/auto_diff.cpp b/taichi/transforms/auto_diff.cpp
index 81c50adf19a57..82f65de408bbc 100644
--- a/taichi/transforms/auto_diff.cpp
+++ b/taichi/transforms/auto_diff.cpp
@@ -656,6 +656,7 @@ class MakeAdjoint : public IRVisitor {
       //     for _ in range(5)
       //         q += a[i]
       if (stmt->is<GlobalLoadStmt>() &&
+          (stmt->parent->parent_stmt != nullptr) &&
           stmt->parent->parent_stmt->is<RangeForStmt>()) {
         // Check whether this GlobalLoadStmt is in the body of a for-loop by
         // searching in the backup forward pass If not (Case 1), the alloca