--- ray/src/common/cone.c	1991/05/22 16:51:12	1.4
+++ ray/src/common/cone.c	1991/10/23 13:43:12	1.6
@@ -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);
@@ -159,11 +161,11 @@ conexform(co)			/* get cone transformation matrix */
 register CONE  *co;
 {
 	double  sqrt(), fabs();
-	double  m4[4][4];
+	MAT4  m4;
 	register double  d;
 	register int  i;
 
-	co->tm = (double (*)[4])malloc(sizeof(m4));
+	co->tm = (FLOAT (*)[4])malloc(sizeof(m4));
 	if (co->tm == NULL)
 		error(SYSTEM, "out of memory in conexform");