diff --git a/libmuonapt/AddRepositoryHelper.cpp b/libmuonapt/AddRepositoryHelper.cpp
--- a/libmuonapt/AddRepositoryHelper.cpp
+++ b/libmuonapt/AddRepositoryHelper.cpp
@@ -9,8 +9,8 @@
 {
     ActionReply reply = ActionReply::SuccessReply();
     if(args["repository"].isNull() || args["action"].isNull()) {
-        reply.setErrorDescription("Invalid action arguments.");
         reply = ActionReply::HelperErrorReply();
+        reply.setErrorDescription("Invalid action arguments.");
         return reply;
     }
     QProcess *p = new QProcess(this);
@@ -31,8 +31,8 @@
     p->start(modRepo,arguments);
     p->waitForFinished();
     if(p->exitCode()) {
-        reply.setErrorDescription("Could not modify source.");
         reply= ActionReply::HelperErrorReply();
+        reply.setErrorDescription("Could not modify source.");
     }
     p->deleteLater();
     return reply;