diff --git a/src/dvb/dvb_preconf.c b/src/dvb/dvb_preconf.c
index d58ee151..21148c9b 100644
--- a/src/dvb/dvb_preconf.c
+++ b/src/dvb/dvb_preconf.c
@@ -183,6 +183,7 @@ dvb_mux_preconf_get_node(int fetype, const char *node)
     nr = sizeof(regions_ATSC) / sizeof(regions_ATSC[0]);
     break;
   default:
+    tvhlog(LOG_ERR, "DVB", "No built-in config for fetype %d", fetype);
     return NULL;
   }
   
diff --git a/src/webui/extjs.c b/src/webui/extjs.c
index 29ae6aaa..0ebf368e 100644
--- a/src/webui/extjs.c
+++ b/src/webui/extjs.c
@@ -468,7 +468,8 @@ extjs_dvbnetworks(http_connection_t *hc, const char *remain, void *opaque)
 
   pthread_mutex_unlock(&global_lock);
 
-  out = dvb_mux_preconf_get_node(tda->tda_type, s);
+  if((out = dvb_mux_preconf_get_node(tda->tda_type, s)) == NULL)
+    return 404;
 
   htsmsg_json_serialize(out, hq, 0);
   htsmsg_destroy(out);