Index: common/MessageProcessor.cpp
===================================================================
--- common/MessageProcessor.cpp	(revision 9a4fa04b6f2bd8e328c02fb82d2cbd17a02153e8)
+++ common/MessageProcessor.cpp	(revision 09ddba7dbba8667a4de6e3bd284419ddef3ea498)
@@ -58,5 +58,5 @@
       cout << "buffer: " << msg->buffer << endl;
 
-      if (ackedMessages.find(msg->id) == ackedMessages.end())
+      if (ackedMessages.find(msg->id) != ackedMessages.end())
          isDuplicate = true;