Index: common/MessageProcessor.cpp
===================================================================
--- common/MessageProcessor.cpp	(revision 3794f6d6f359025d4bb6f4aaa99a8ab1849eaf63)
+++ common/MessageProcessor.cpp	(revision cc6a14a1ae55509486d83bf26b50839a36a6cbcc)
@@ -53,5 +53,5 @@
       cout << "buffer: " << msg->buffer << endl;
 
-      if (ackedMessages.find(msg->id) != ackedMessages.end()) {
+      if (ackedMessages.find(msg->id) == ackedMessages.end()) {
          cout << "Not a duplicate" << endl;