From 25029568358e70ac92c6048af4001f4c379ab788 Mon Sep 17 00:00:00 2001
From: Guy Benoish <guy.benoish@redislabs.com>
Date: Wed, 23 Jan 2019 11:11:57 +0200
Subject: [PATCH] ZPOP should return an empty array if COUNT=0

---
 src/t_zset.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/t_zset.c b/src/t_zset.c
index 0427ee88..1c3da1a2 100644
--- a/src/t_zset.c
+++ b/src/t_zset.c
@@ -3140,7 +3140,10 @@ void genericZpopCommand(client *c, robj **keyv, int keyc, int where, int emitkey
     if (countarg) {
         if (getLongFromObjectOrReply(c,countarg,&count,NULL) != C_OK)
             return;
-        if (count < 0) count = 1;
+        if (count <= 0) {
+            addReplyNullArray(c);
+            return;
+        }
     }
 
     /* Check type and break on the first error, otherwise identify candidate. */