diff --git a/src/platform/DARWIN/AFSPreference/IpConfiguratorCommander.m b/src/platform/DARWIN/AFSPreference/IpConfiguratorCommander.m
index 70a50abb78..9768785ff4 100644
--- a/src/platform/DARWIN/AFSPreference/IpConfiguratorCommander.m
+++ b/src/platform/DARWIN/AFSPreference/IpConfiguratorCommander.m
@@ -49,6 +49,7 @@
 	[bkIPArray removeAllObjects];
 	[bkIPArray setArray:workIPArray];
 	[workIPArray release];
+	workIPArray = nil;
 }
 
 // -------------------------------------------------------------------------------