Index: src/incidencedialog.cpp
===================================================================
--- src/incidencedialog.cpp
+++ src/incidencedialog.cpp
@@ -181,10 +181,19 @@
     mIeResource = new IncidenceResource(mIeAttendee, mIeDateTime, mUi);
     mEditor->combine(mIeResource);
 
+    // Select calendar to last collection used, if valid; else select the default collection
     const qint64 colId = IncidenceEditorNG::IncidenceEditorSettings::self()->lastSelectedFolder();
     const Akonadi::Collection col(colId);
     if (col.isValid()) {
         mCalSelector->setDefaultCollection(col);
+    } else {
+        const qint64 defColId = CalendarSupport::KCalPrefs::instance()->defaultCalendarId();
+        const Akonadi::Collection defCol(defColId);
+        if (defCol.isValid()) {
+            mCalSelector->setDefaultCollection(defCol);
+        } else {
+            mCalSelector->setCurrentIndex(0);
+        }
     }
 
     q->connect(mEditor, SIGNAL(showMessage(QString,KMessageWidget::MessageType)),
@@ -777,9 +786,17 @@
     if (collection.isValid()) {
         d->mCalSelector->setDefaultCollection(collection);
     } else {
+        // fallback to default collection
+        const qint64 defColId = CalendarSupport::KCalPrefs::instance()->defaultCalendarId();
+        const Akonadi::Collection defCol(defColId);
+        if (defCol.isValid()) {
+            d->mCalSelector->setDefaultCollection(defCol);
+        } else {
+            // Give up and use the first item in the selector
             d->mCalSelector->setCurrentIndex(0);
         }
     }
+}
 
 void IncidenceDialog::setIsCounterProposal(bool isCounterProposal)
 {