--- a/src/newgrf_config.cpp	Fri Sep 28 16:05:40 2007 +0000
+++ b/src/newgrf_config.cpp	Fri Sep 28 17:04:52 2007 +0000
@@ -406,6 +406,7 @@
 	}
 
 	DEBUG(grf, 1, "Scan complete, found %d files", num);
+	if (num == 0 || _all_grfs == NULL) return;
 
 	/* Sort the linked list using quicksort.
 	 * For that we first have to make an array, the qsort and