diff --git a/etc/inc/IPv6.inc b/etc/inc/IPv6.inc
index e4f86bd3f8..519cbcd09e 100644
--- a/etc/inc/IPv6.inc
+++ b/etc/inc/IPv6.inc
@@ -748,6 +748,12 @@ class Net_IPv6
         $cip = preg_replace('/((^:)|(:$))/', '', $cip);
         $cip = preg_replace('/((^:)|(:$))/', '::', $cip);
 
+        if (empty($cip)) {
+
+            $cip = "::";
+
+        }
+
         if ('' != $netmask) {
 
             $cip = $cip.'/'.$netmask;