diff --git a/plugins/UiConfig/media/js/UiConfig.coffee b/plugins/UiConfig/media/js/UiConfig.coffee
index d0fbffd6..4c11d428 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 value
+			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 a587e5a4..8e24b298 100644
--- a/plugins/UiConfig/media/js/all.js
+++ b/plugins/UiConfig/media/js/all.js
@@ -1450,7 +1450,6 @@
 }).call(this);
 
 
-
 /* ---- plugins/UiConfig/media/js/ConfigView.coffee ---- */
 
 
@@ -1774,7 +1773,7 @@
         if (value_same_as_default) {
           value = null;
         }
-        if (this.config[item.key].item.valid_pattern && value) {
+        if (this.config[item.key].item.valid_pattern && !this.config[item.key].item.isHidden()) {
           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 + ")";
@@ -1883,4 +1882,4 @@
 
   window.Page.createProjector();
 
-}).call(this);
\ No newline at end of file
+}).call(this);
diff --git a/src/Config.py b/src/Config.py
index fc92f3e8..0992b1e3 100644
--- a/src/Config.py
+++ b/src/Config.py
@@ -10,7 +10,7 @@ class Config(object):
 
     def __init__(self, argv):
         self.version = "0.6.3"
-        self.rev = 3608
+        self.rev = 3609
         self.argv = argv
         self.action = None
         self.pending_changes = {}