diff --git a/src/Views/RevisionFiles.axaml.cs b/src/Views/RevisionFiles.axaml.cs
index fabe952f3..aa274f1d9 100644
--- a/src/Views/RevisionFiles.axaml.cs
+++ b/src/Views/RevisionFiles.axaml.cs
@@ -29,7 +29,7 @@ private async void OnSearchBoxKeyDown(object _, KeyEventArgs e)
             }
             else if (e.Key == Key.Down || e.Key == Key.Up)
             {
-                if (vm.RevisionFileSearchSuggestion.Count > 0)
+                if (vm.RevisionFileSearchSuggestion?.Count > 0)
                 {
                     SearchSuggestionBox.Focus(NavigationMethod.Tab);
                     SearchSuggestionBox.SelectedIndex = 0;