diff --git a/app/musicmuster.py b/app/musicmuster.py
index 21daf47..2992a4d 100755
--- a/app/musicmuster.py
+++ b/app/musicmuster.py
@@ -157,7 +157,10 @@ class ImportTrack(QObject):
         super().__init__()
         self.filenames = filenames
         self.source_model = source_model
-        self.next_row_number = row_number
+        if row_number is None:
+            self.next_row_number = source_model.rowCount()
+        else:
+            self.next_row_number = row_number
         self.signals = MusicMusterSignals()
 
     def run(self):