diff --git a/src/urh/controller/CompareFrameController.py b/src/urh/controller/CompareFrameController.py
index 56aa4364e9..93769a416d 100644
--- a/src/urh/controller/CompareFrameController.py
+++ b/src/urh/controller/CompareFrameController.py
@@ -1386,7 +1386,7 @@ def on_table_selection_timer_timeout(self):
 
     @pyqtSlot(int)
     def on_ref_index_changed(self, new_ref_index: int):
-        if new_ref_index != -1:
+        if new_ref_index != -1 and self.protocol_model.row_count:
             hide_correction = 0
             for i in range(0, self.protocol_model.row_count):
                 if self.ui.tblViewProtocol.isRowHidden((new_ref_index + i) % self.protocol_model.row_count):