diff --git a/dzgui/views/trees/tree_base.py b/dzgui/views/trees/tree_base.py
index 8a32e2f..fbb3a1f 100644
--- a/dzgui/views/trees/tree_base.py
+++ b/dzgui/views/trees/tree_base.py
@@ -85,8 +85,9 @@ class TreeView(CursorMixin, Gtk.TreeView):  # type: ignore
         model, rows = sel.get_selected_rows()
         return [model[row] for row in rows]
 
-    def _on_keypress(self, treeview: Gtk.TreeView, event: Gdk.EventKey) -> None:
+    def _on_keypress(self, treeview: Gtk.TreeView, event: Gdk.EventKey) -> bool:
         from dzgui.views.trees.tree_servers import ServerTreeView
+
         # NOTE: suppress popup search and delegate binding to server view (cf. request_keyword_focus)
         if not isinstance(treeview, ServerTreeView):
             if is_ctrl_mask(event) and event.keyval == Gdk.KEY_f:
@@ -94,7 +95,7 @@ class TreeView(CursorMixin, Gtk.TreeView):  # type: ignore
 
         if is_navkey(event.keyval):
             if self.get_model() is None:
-                return
+                return True
             if self.sel_blocked is False:
                 self.sel_blocked = True
                 self.controller.suppress_signal(
@@ -104,7 +105,7 @@ class TreeView(CursorMixin, Gtk.TreeView):  # type: ignore
                     True,
                 )
             self._vim_nav(event)
-        return
+        return False
 
     def _on_key_release(self, treeview: Gtk.TreeView, event: Gdk.EventKey) -> None:
         """