From d6e7ea794d97e0525615939a935ea952c74b03e1 Mon Sep 17 00:00:00 2001
From: Paul Gilbert
Date: Sun, 17 Feb 2019 20:44:14 -0800
Subject: GLK: FROTZ: Fix erasing windows that don't have an associated GLK
 window

---
 engines/glk/frotz/processor_screen.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'engines')

diff --git a/engines/glk/frotz/processor_screen.cpp b/engines/glk/frotz/processor_screen.cpp
index 2cc9080804..3f45b06c6b 100644
--- a/engines/glk/frotz/processor_screen.cpp
+++ b/engines/glk/frotz/processor_screen.cpp
@@ -213,7 +213,8 @@ void Processor::erase_window(zword win) {
 	if (h_version == V6 && win != cwin && h_interpreter_number != INTERP_AMIGA)
 		garglk_set_zcolors(_wp[win][TRUE_FG_COLOR], _wp[win][TRUE_BG_COLOR]);
 
-	glk_window_clear(_wp[win]);
+	if (_wp[win])
+		glk_window_clear(_wp[win]);
 
 	if (h_version == V6 && win != cwin && h_interpreter_number != INTERP_AMIGA)
 		garglk_set_zcolors(_wp[cwin][TRUE_FG_COLOR], _wp[cwin][TRUE_BG_COLOR]);
-- 
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