--- ray/src/common/cone.c	1991/05/22 16:51:12	1.4
+++ ray/src/common/cone.c	1991/07/17 14:10:16	1.5
@@ -148,6 +148,8 @@ OBJREC  *o;
 {
 	register CONE  *co = (CONE *)o->os;
 
+	if (o->os == NULL)
+		return;
 	if (co->tm != NULL)
 		free((char *)co->tm);
 	free(o->os);