From efdf09be36e16daccd349fda96584be7d6f8c292 Mon Sep 17 00:00:00 2001
From: John Sully <john@csquare.ca>
Date: Fri, 3 Jan 2020 17:06:07 -0500
Subject: [PATCH] Fix crash with subkey expire

Former-commit-id: 8e1d416714484ff6ff4242c5d9a24b1458bbfb7b
---
 src/sds.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/sds.c b/src/sds.c
index d6027725f..10bab6089 100644
--- a/src/sds.c
+++ b/src/sds.c
@@ -178,6 +178,8 @@ sds sdsdup(const char *s) {
 }
 
 sds sdsdupshared(const char *s) {
+    if (s == NULL)
+        return NULL;
     unsigned char flags = s[-1];
     if ((flags & SDS_TYPE_MASK) != SDS_TYPE_REFCOUNTED)
         return sdsnewlen(s, -sdslen(s));