diff --git a/config.js b/config.js
index f03c739..6dca40f 100644
--- a/config.js
+++ b/config.js
@@ -26,7 +26,7 @@ function F() {
         if (!t.data[sgroups[i]]) t.data[sgroups[i]] = {};
         var snames = Object.keys(sgroup);
         for (var j = 0; j < snames.length; j++) {
-          if (!t.data[sgroups[i]][snames[j]]) {
+          if (typeof t.data[sgroups[i]][snames[j]] == "undefined") {
             t.data[sgroups[i]][snames[j]] = sgroup[snames[j]].default || "";
           }
           switch (sgroup[snames[j]].type || "none") {