diff --git a/lib/protocol.js b/lib/protocol.js
index 1023526..6f954c3 100644
--- a/lib/protocol.js
+++ b/lib/protocol.js
@@ -1450,8 +1450,10 @@ function parsePacket(buffer, isServer) {
   for (i = 0; i < packetInfo.length; ++i) {
     fieldInfo = packetInfo[i];
     var condition = fieldInfo.condition;
-    if (typeof condition != "undefined" && !condition(results))
+    if (typeof condition != "undefined" && !condition(results)) {
+      results[fieldInfo.name] = null;
       continue;
+    }
     readResults = readPacketField(fieldInfo);
     if (!readResults || readResults.error) {
       return readResults;