From d873c549a2aa23b5a05e3085f25cbcbb2bef2cfd Mon Sep 17 00:00:00 2001
From: Haoyu Qiu <timothyqiu32@gmail.com>
Date: Fri, 30 Sep 2022 09:32:44 +0800
Subject: Fix crash when executing `ResourceUID.set_id`

---
 core/io/resource_uid.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'core/io')

diff --git a/core/io/resource_uid.cpp b/core/io/resource_uid.cpp
index 5324c5dd84..ed5ce3b911 100644
--- a/core/io/resource_uid.cpp
+++ b/core/io/resource_uid.cpp
@@ -113,7 +113,12 @@ void ResourceUID::set_id(ID p_id, const String &p_path) {
 	MutexLock l(mutex);
 	ERR_FAIL_COND(!unique_ids.has(p_id));
 	CharString cs = p_path.utf8();
-	if (strcmp(cs.ptr(), unique_ids[p_id].cs.ptr()) != 0) {
+	const char *update_ptr = cs.ptr();
+	const char *cached_ptr = unique_ids[p_id].cs.ptr();
+	if (update_ptr == nullptr && cached_ptr == nullptr) {
+		return; // Both are empty strings.
+	}
+	if ((update_ptr == nullptr) != (cached_ptr == nullptr) || strcmp(update_ptr, cached_ptr) != 0) {
 		unique_ids[p_id].cs = cs;
 		unique_ids[p_id].saved_to_cache = false; //changed
 		changed = true;
-- 
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