Index: sources/canbus/MessageInterpreter.cpp
===================================================================
diff -u -rb61d8a3e01fef66eee8095c9cddf835d9bb32b66 -r0583a63307936f09e184dfe16acca25f9e3fd81c
--- sources/canbus/MessageInterpreter.cpp	(.../MessageInterpreter.cpp)	(revision b61d8a3e01fef66eee8095c9cddf835d9bb32b66)
+++ sources/canbus/MessageInterpreter.cpp	(.../MessageInterpreter.cpp)	(revision 0583a63307936f09e184dfe16acca25f9e3fd81c)
@@ -268,7 +268,7 @@
         break;
 
     case Gui::GuiActionType::ID_ConfirmTreatmentReq:
-        if ( length != 0 ) { logInvalidLength(vActionId); return false; }
+        if ( ! length ) { logInvalidLength(vActionId); return false; }
         vPayload = Format::fromVariant(vData);
         LOG_EVENT(ConfirmTreatmentRequestData::toString(vData));
         break;