From d14597f1eebfa67a69206898e671177d7af7672f Mon Sep 17 00:00:00 2001
From: Vicki Pfau <vi@endrift.com>
Date: Mon, 17 Feb 2020 17:55:29 -0800
Subject: [PATCH] Core: Fix crash modifying hash table entry (fixes #1673)

---
 CHANGES          | 1 +
 src/util/table.c | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index 16c20e19e..de2accb11 100644
--- a/CHANGES
+++ b/CHANGES
@@ -13,6 +13,7 @@ Emulation fixes:
 Other fixes:
  - Core: Ensure ELF regions can be written before trying
  - Core: Fix ELF loading regression (fixes mgba.io/i/1669)
+ - Core: Fix crash modifying hash table entry (fixes mgba.io/i/1673)
  - Debugger: Don't skip undefined instructions when debugger attached
  - Qt: Force OpenGL paint engine creation thread (fixes mgba.io/i/1642)
 Misc:
diff --git a/src/util/table.c b/src/util/table.c
index 20f4e159b..f4a85557f 100644
--- a/src/util/table.c
+++ b/src/util/table.c
@@ -187,7 +187,9 @@ void HashTableInsert(struct Table* table, const char* key, void* value) {
 	struct TableList* list;
 	TABLE_LOOKUP_START(HASH_TABLE_COMPARATOR, list, hash) {
 		if (value != lookupResult->value) {
-			table->deinitializer(lookupResult->value);
+			if (table->deinitializer) {
+				table->deinitializer(lookupResult->value);
+			}
 			lookupResult->value = value;
 		}
 		return;