--- mhash-0.9.9/lib/whirlpool.c	2006-01-08 03:14:47.000000000 -0500
+++ mhash-0.9.9-new/lib/whirlpool.c	2009-01-16 00:17:34.000000000 -0500
@@ -970,6 +970,8 @@
                     mutils_word8 * digest)
 {
    mutils_word32 i;
+
+   if(!digest) return;
     /*
      * return the completed message digest:
      */