1 files changed, 3 insertions, 0 deletions
diff --git a/src/window.c b/src/window.c
index 08fd8c829fa..9b50a85b0ca 100644
--- a/src/window.c
+++ b/src/window.c
@@ -1533,6 +1533,9 @@ Signal an error when WINDOW is the only window on its frame.  */)
   struct frame *f;
   if (NILP (window))
     window = selected_window;
+  else
+    CHECK_LIVE_WINDOW (window);
+
   f = XFRAME (WINDOW_FRAME (XWINDOW (window)));
   delete_window (window);