diff --git a/src/cg3protocol.cpp b/src/cg3protocol.cpp
index f08b57c..f6a18a5 100644
--- a/src/cg3protocol.cpp
+++ b/src/cg3protocol.cpp
@@ -621,7 +621,7 @@ bool CG3Protocol::OnDvHeaderPacketIn(CDvHeaderPacket *Header, const CIp &Ip)
                         // drop if invalid module
                         delete Header;
                         g_Reflector.ReleaseClients();
-                        return NULL;
+                        return false;
                     }
                 }