Index: read.c
===================================================================
--- read.c	(revision 28990)
+++ read.c	(revision 28991)
@@ -479,9 +479,10 @@
 	}
 
 	tmp = find_nth(rp->first_child, "XY", 0);
-	parse_xy(ctx, tmp->argv[1], &x1, &y1, 1);
-	parse_xy(ctx, tmp->argv[2], &x2, &y2, 1);
-
+	if (parse_xy(ctx, tmp->argv[1], &x1, &y1, 1) != 0)
+		return hkp_error(rp, "Failed to parse rect start point (%s), can't place rectangle\n", tmp->argv[1]);
+	if (parse_xy(ctx, tmp->argv[2], &x2, &y2, 1) != 0)
+		return hkp_error(rp, "Failed to parse rect end point (%s), can't place rectangle\n", tmp->argv[2]);
 	if (filled) {
 		pcb_coord_t cl = net_get_clearance(ctx, ly, nc, HKP_CLR_POLY2POLY, tmp) * 2;
 TODO("when to generate a rounded corner?");