--- part.c.orig	2018-10-11 14:39:55.425356265 -0600
+++ part.c	2018-10-11 14:47:36.000165576 -0600
@@ -1767,8 +1767,8 @@ static int rec01(INT ni, OP vec)
 /* to compute number of partitions */
 {
     INT erg = OK;
-    if (ni<0) return;
-    if (not EMPTYP(S_V_I(vec,ni))) return;
+    if (ni<0) return 0;
+    if (not EMPTYP(S_V_I(vec,ni))) return 0;
     else if (ni<=1) M_I_I(1,S_V_I(vec,ni));
     else {