--- ray/src/common/face.c	1989/07/28 14:27:44	1.3
+++ ray/src/common/face.c	1991/07/17 14:10:13	1.4
@@ -99,6 +99,8 @@ OBJREC  *o;
 freeface(o)			/* free memory associated with face */
 OBJREC  *o;
 {
+	if (o->os == NULL)
+		return;
 	free(o->os);
 	o->os = NULL;
 }