diff --git a/plugins/UiConfig/media/js/UiConfig.coffee b/plugins/UiConfig/media/js/UiConfig.coffee
index 4c11d428..1bdd6756 100644
--- a/plugins/UiConfig/media/js/UiConfig.coffee
+++ b/plugins/UiConfig/media/js/UiConfig.coffee
@@ -59,7 +59,7 @@ class UiConfig extends ZeroFrame
 			if value_same_as_default
 				value = null
 
-			if @config[item.key].item.valid_pattern and not @config[item.key].item.isHidden()
+			if @config[item.key].item.valid_pattern and not @config[item.key].item.isHidden?()
 				match = value.match(@config[item.key].item.valid_pattern)
 				if not match or match[0] != value
 					message = "Invalid value of #{@config[item.key].item.title}: #{value} (does not matches #{@config[item.key].item.valid_pattern})"
diff --git a/plugins/UiConfig/media/js/all.js b/plugins/UiConfig/media/js/all.js
index 8e24b298..50b69c2a 100644
--- a/plugins/UiConfig/media/js/all.js
+++ b/plugins/UiConfig/media/js/all.js
@@ -1762,7 +1762,7 @@
     };
 
     UiConfig.prototype.saveValues = function(cb) {
-      var changed_values, i, item, j, last, len, match, message, results, value, value_same_as_default;
+      var base, changed_values, i, item, j, last, len, match, message, results, value, value_same_as_default;
       changed_values = this.getValuesChanged();
       results = [];
       for (i = j = 0, len = changed_values.length; j < len; i = ++j) {
@@ -1773,7 +1773,7 @@
         if (value_same_as_default) {
           value = null;
         }
-        if (this.config[item.key].item.valid_pattern && !this.config[item.key].item.isHidden()) {
+        if (this.config[item.key].item.valid_pattern && !(typeof (base = this.config[item.key].item).isHidden === "function" ? base.isHidden() : void 0)) {
           match = value.match(this.config[item.key].item.valid_pattern);
           if (!match || match[0] !== value) {
             message = "Invalid value of " + this.config[item.key].item.title + ": " + value + " (does not matches " + this.config[item.key].item.valid_pattern + ")";
diff --git a/src/Config.py b/src/Config.py
index d8a07146..ae1760de 100644
--- a/src/Config.py
+++ b/src/Config.py
@@ -10,7 +10,7 @@ class Config(object):
 
     def __init__(self, argv):
         self.version = "0.6.4"
-        self.rev = 3671
+        self.rev = 3672
         self.argv = argv
         self.action = None
         self.pending_changes = {}