diff --git a/incidenceeditor-ng/incidencecategories.h b/incidenceeditor-ng/incidencecategories.h
--- a/incidenceeditor-ng/incidencecategories.h
+++ b/incidenceeditor-ng/incidencecategories.h
@@ -52,6 +52,7 @@
 
   private slots:
     void onSelectionChanged(const Akonadi::Tag::List &);
+    void onTagsFetchResult();
     void onTagsReceived(const Akonadi::Tag::List &);
     void onTagCreated(KJob *job);
 
@@ -67,6 +68,7 @@
 
     Ui::EventOrTodoDesktop *mUi;
     Akonadi::Tag::List mSelectedTags;
+    QStringList mCategoriesToCheck;
     bool mDirty;
 };
 
diff --git a/incidenceeditor-ng/incidencecategories.cpp b/incidenceeditor-ng/incidencecategories.cpp
--- a/incidenceeditor-ng/incidencecategories.cpp
+++ b/incidenceeditor-ng/incidencecategories.cpp
@@ -104,23 +104,26 @@
 void IncidenceCategories::checkForUnknownCategories( const QStringList &categoriesToCheck )
 {
     Akonadi::TagFetchJob *fetchJob = new Akonadi::TagFetchJob();
-    fetchJob->setProperty("categoriesToCheck", categoriesToCheck);
+    mCategoriesToCheck = categoriesToCheck;
     connect(fetchJob, SIGNAL(tagsReceived(Akonadi::Tag::List)), this, SLOT(onTagsReceived(Akonadi::Tag::List)));
+    connect(fetchJob, SIGNAL(result(KJob *)), this, SLOT(onTagsFetchResult()));
 }
 
 void IncidenceCategories::onTagsReceived(const Akonadi::Tag::List &tags)
 {
-    QStringList tagsToCheck = sender()->property("categoriesToCheck").toStringList();
     foreach (const Akonadi::Tag &tag, tags) {
-        if (tagsToCheck.contains(tag.gid()) || tagsToCheck.contains(tag.name())) {
+        if (mCategoriesToCheck.contains(tag.gid()) || mCategoriesToCheck.contains(tag.name())) {
             mSelectedTags << tag;
         }
-        tagsToCheck.removeAll(tag.gid());
-        tagsToCheck.removeAll(tag.name());
+        mCategoriesToCheck.removeAll(tag.gid());
+        mCategoriesToCheck.removeAll(tag.name());
     }
     mUi->mTagWidget->setSelection(mSelectedTags);
+}
 
-    foreach ( const QString &category, tagsToCheck ) {
+void IncidenceCategories::onTagsFetchResult()
+{
+    foreach ( const QString &category, mCategoriesToCheck ) {
         kDebug() << "Creating tag: " << category;
         Akonadi::Tag tag = Akonadi::Tag::genericTag(category);
         tag.setGid(category.toUtf8());