--- a/src/newgrf_station.cpp	Wed Apr 23 21:55:24 2008 +0000
+++ b/src/newgrf_station.cpp	Wed Apr 23 22:16:41 2008 +0000
@@ -676,7 +676,7 @@
 {
 	uint i;
 
-	if (statspec == NULL) return 0;
+	if (statspec == NULL || st == NULL) return 0;
 
 	/* Check if this spec has already been allocated */
 	for (i = 1; i < st->num_specs && i < MAX_SPECLIST; i++) {