===================================================================
RCS file: /home/cvs/OpenXM/src/kan96xx/Kan/syz0.c,v
retrieving revision 1.3
retrieving revision 1.5
diff -u -p -r1.3 -r1.5
--- OpenXM/src/kan96xx/Kan/syz0.c	2001/05/04 01:06:26	1.3
+++ OpenXM/src/kan96xx/Kan/syz0.c	2005/07/03 11:08:54	1.5
@@ -1,5 +1,6 @@
-/* $OpenXM: OpenXM/src/kan96xx/Kan/syz0.c,v 1.2 2000/01/16 07:55:41 takayama Exp $ */
+/* $OpenXM: OpenXM/src/kan96xx/Kan/syz0.c,v 1.4 2003/08/27 03:11:12 takayama Exp $ */
 #include <stdio.h>
+#include <stdlib.h>
 #include "datatype.h"
 #include "extern2.h"
 #include "matrix.h"
@@ -237,6 +238,7 @@ struct matrixOfPOLY *getSyzygy(grG,zeroPairs,grBasesp,
 
   if (KanGBmessage) {printf("#"); fflush(stdout); }
   mp0 = getSyzygy01(*grBasesp,excludePairs);
+  if (mp0 == NULL) return NULL;
   if (KanGBmessage) {printf("#"); fflush(stdout); }
   
   /* We compute E-CB. The number of G (G-basis) is serial. */