diff -up ghostscript-9.02/cups/colord.c.colord ghostscript-9.02/cups/colord.c
--- ghostscript-9.02/cups/colord.c.colord	2011-04-12 11:09:49.852203837 +0100
+++ ghostscript-9.02/cups/colord.c	2011-04-12 11:11:11.226356829 +0100
@@ -316,9 +316,14 @@ char *
 colord_get_profile_for_device_id (const char *device_id,
                               const char **qualifier_tuple)
 {
-  DBusConnection *con;
+  DBusConnection *con = NULL;
   char *filename = NULL;
 
+  if (device_id == NULL) {
+    fprintf(stderr, "DEBUG: No colord device ID available\n");
+    goto out;
+  }
+
   /* connect to system bus */
   con = dbus_bus_get(DBUS_BUS_SYSTEM, NULL);
   if (con == NULL) {