From 9797d4a8f22b82863d00d9d0efc9aefad8445b55 Mon Sep 17 00:00:00 2001
From: John Sully <john@csquare.ca>
Date: Mon, 15 Jun 2020 19:47:06 -0400
Subject: [PATCH] Fix crash in async delete when storage provider is not set
 and key doesn't actually exist

Former-commit-id: 4a4828390118ab52851d8bf229c4ae853100053c
---
 src/lazyfree.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/lazyfree.cpp b/src/lazyfree.cpp
index 6bca4481b..141df38f2 100644
--- a/src/lazyfree.cpp
+++ b/src/lazyfree.cpp
@@ -60,9 +60,10 @@ bool redisDbPersistentData::asyncDelete(robj *key) {
         return syncDelete(key); // async delte never makes sense with a storage provider
 
     dictEntry *de = dictUnlink(m_pdict,ptrFromObj(key));
-    if (m_pdbSnapshot != nullptr && m_pdbSnapshot->find_cached_threadsafe(szFromObj(key)) != nullptr)
-        dictAdd(m_pdictTombstone, sdsdup((sds)dictGetKey(de)), nullptr);
     if (de) {
+        if (m_pdbSnapshot != nullptr && m_pdbSnapshot->find_cached_threadsafe(szFromObj(key)) != nullptr)
+            dictAdd(m_pdictTombstone, sdsdup((sds)dictGetKey(de)), nullptr);
+
         robj *val = (robj*)dictGetVal(de);
         if (val->FExpires())
         {