diff --git a/qutebrowser/completion/completionwidget.py b/qutebrowser/completion/completionwidget.py
index 7177f1897..6e83e6fee 100644
--- a/qutebrowser/completion/completionwidget.py
+++ b/qutebrowser/completion/completionwidget.py
@@ -199,6 +199,9 @@ class CompletionView(QTreeView):
             return
 
         idx = self._next_idx(prev)
+        if not idx.isValid():
+            return
+
         selmodel.setCurrentIndex(
             idx, QItemSelectionModel.ClearAndSelect | QItemSelectionModel.Rows)