From 2b5673786824f21bd1cec0770dce2ca934b82ff6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Markus=20M=C3=A4kel=C3=A4?= <markus.makela@mariadb.com>
Date: Fri, 13 Dec 2019 07:07:41 +0200
Subject: [PATCH] Fix debug assertion

The GWBUF_IS_CONTIGUOUS macro changed in 2.4 and it no longer allows null
arguments.
---
 server/modules/protocol/MySQL/mariadbbackend/mysql_backend.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/modules/protocol/MySQL/mariadbbackend/mysql_backend.cc b/server/modules/protocol/MySQL/mariadbbackend/mysql_backend.cc
index e6747c9b6..b18bdafaf 100644
--- a/server/modules/protocol/MySQL/mariadbbackend/mysql_backend.cc
+++ b/server/modules/protocol/MySQL/mariadbbackend/mysql_backend.cc
@@ -1021,7 +1021,7 @@ static int gw_read_and_write(DCB* dcb)
         {
             stmt = modutil_get_next_MySQL_packet(&read_buffer);
 
-            if (!GWBUF_IS_CONTIGUOUS(stmt))
+            if (stmt && !GWBUF_IS_CONTIGUOUS(stmt))
             {
                 // Make sure the buffer is contiguous
                 stmt = gwbuf_make_contiguous(stmt);