From 7c20266a22c170ba66a9c9a82d9fd214bfb7fa48 Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Thu, 20 Apr 2017 23:40:22 +0200
Subject: [PATCH] sys: shell: gnrc_6ctx: fix gnrc_6ctx_add error handling

---
 sys/shell/commands/sc_gnrc_6ctx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/shell/commands/sc_gnrc_6ctx.c b/sys/shell/commands/sc_gnrc_6ctx.c
index 29e21eb850..c47242ac03 100644
--- a/sys/shell/commands/sc_gnrc_6ctx.c
+++ b/sys/shell/commands/sc_gnrc_6ctx.c
@@ -91,7 +91,7 @@ int _gnrc_6ctx_add(char *cmd_str, char *ctx_str, char *prefix_str, char *ltime_s
         return 1;
     }
     prefix_len_str = strtok_r(NULL, "/", &save_ptr);
-    if (addr_str == NULL) {
+    if (prefix_len_str == 0) {
         _usage(cmd_str);
         return 1;
     }