From df27f8420d8bbbf645be6962706a48728859618f Mon Sep 17 00:00:00 2001
From: jacksonmj <mj-pt@jacksonmj.co.uk>
Date: Mon, 21 Mar 2011 16:26:58 +0000
Subject: Fix crash when trying to move to invalid co-ordinates


diff --git a/src/powder.c b/src/powder.c
index 7e26422..b77a52d 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -136,6 +136,8 @@ int try_move(int i, int x, int y, int nx, int ny)
 
 	if (x==nx && y==ny)
 		return 1;
+	if (nx<0 || ny<0 || nx>=XRES || ny>=YRES)
+		return 1;
 
 	e = eval_move(parts[i].type, nx, ny, &r);
 
--
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