if prefix==false set dimPrefix=0

src/PacketStream.cpp

@@ -200,6 +200,9 @@ bool PacketStream::createStreamStructure() throw(PacketException*)
                 /// dimensione of prefix
                 //delete[] line;
                 line = config.getLine();
+				if(prefix == false)
+					dimPrefix = 0;
+				else
 					dimPrefix = atoi(line);
             }
             else