From 217e16c10fa9fa32083ad59cb74ee50d21091777 Mon Sep 17 00:00:00 2001
From: Karl Heuer <kwzh@gnu.org>
Date: Fri, 3 Mar 1995 02:08:49 +0000
Subject: [PATCH] (cmd_error): Allow current_perdisplay to be null.

---
 src/keyboard.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/keyboard.c b/src/keyboard.c
index 78f42ce5c7b..8212d2aedc0 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -768,15 +768,19 @@ cmd_error (data)
   Vstandard_output = Qt;
   Vstandard_input = Qt;
   Vexecuting_macro = Qnil;
-  clear_prefix_arg ();
-  cancel_echoing ();
+  if (current_perdisplay)
+    {
+      clear_prefix_arg ();
+      cancel_echoing ();
+    }
   cmd_error_internal (data, 0);
 
   Vquit_flag = Qnil;
 
   Vinhibit_quit = Qnil;
 #ifdef MULTI_PERDISPLAY
-  unlock_display ();
+  if (current_perdisplay)
+    unlock_display ();
 #endif
 
   return make_number (0);
-- 
2.39.5