--- classes.orig        Mon Nov 19 00:06:13 2007
+++ classes.c   Mon Nov 19 00:04:55 2007
@@ -257,6 +257,13 @@
   }

  /*
+  * Make sure that the class has at least one printer
+  */
+
+  if (!c->num_printers)
+       return (NULL);
+
+ /*
   * Make sure that the last printer is also a valid index into the printer
   * array.  If not, reset the last printer to 0...
   */