--- d_ugen.c.org	2006-08-24 15:05:04.000000000 +0200
+++ d_ugen.c	2006-08-24 15:05:13.000000000 +0200
@@ -333,7 +333,7 @@
     if (dsp_chain)
     {
         t_int *ip;
-        for (ip = dsp_chain; ip; ) ip = (*(t_perfroutine)(*ip))(ip);
+        for (ip = dsp_chain; *ip; ) ip = (*(t_perfroutine)(*ip))(ip);
         dsp_phase++;
     }
 }