diff --git a/transporthandler.cpp b/transporthandler.cpp
index f89f8f3..0c6e4ac 100644
--- a/transporthandler.cpp
+++ b/transporthandler.cpp
@@ -888,6 +888,10 @@
                 lastDisabledVlan[channel] = vlan;
                 vlan = 0;
             }
+            else if (vlan == 0 || vlan == VLAN_VALUE_MASK)
+            {
+                return responseInvalidFieldRequest();
+            }
 
             channelCall<reconfigureVLAN>(channel, vlan);
             return responseSuccess();