diff --git a/js/settings.js b/js/settings.js
index 979770b..cf49ac5 100644
--- a/js/settings.js
+++ b/js/settings.js
@@ -73,13 +73,23 @@ user_sql.adminSettingsUI = function () {
 
                         if (data.status === "success") {
                             for (var index = 0, length = data.data.length; index < length; ++index) {
-                                content.append("<div><label for=\"opt-crypto_param_" + index
-                                    + "\"><span>" + data.data[index]["name"]
-                                    + "</span><input type=\"number\" id=\"opt-crypto_param_"
-                                    + index + "\" name=\"opt-crypto_param_" + index
-                                    + "\" step=\"1\" min=\"" + data.data[index]["min"] + "\" max=\""
-                                    + data.data[index]["max"] + "\" value=\"" + data.data[index]["value"]
-                                    + "\"></label></div>");
+                                var param = $("<div></div>");
+                                var label = $("<label></label>").attr({for: "opt-crypto_param_" + index});
+                                var title = $("<span></span>").text(data.data[index]["name"]);
+                                var input = $("<input/>").attr({
+                                    type: "number",
+                                    id: "opt-crypto_param_" + index,
+                                    name: "opt-crypto_param_" + index,
+                                    step: 1,
+                                    min: data.data[index]["min"],
+                                    max: data.data[index]["max"],
+                                    value: data.data[index]["value"]
+                                });
+
+                                label.append(title);
+                                param.append(label);
+                                param.append(input);
+                                content.append(param);
                                 content.show();
                             }
                         }
diff --git a/lib/Controller/SettingsController.php b/lib/Controller/SettingsController.php
index 5532f23..70de2f5 100644
--- a/lib/Controller/SettingsController.php
+++ b/lib/Controller/SettingsController.php
@@ -399,7 +399,7 @@ class SettingsController extends Controller
                     "CRYPTO_PARAM_" . $key
                 )];
 
-                if (!empty($param)) {
+                if (!is_null($param)) {
                     $value->value = $param;
                 }
             }
diff --git a/lib/Properties.php b/lib/Properties.php
index b030b82..6e20ef8 100644
--- a/lib/Properties.php
+++ b/lib/Properties.php
@@ -70,7 +70,8 @@ class Properties implements \ArrayAccess
      */
     public function __construct(
         $AppName, IConfig $config, ILogger $logger, Cache $cache
-    ) {
+    )
+    {
         $this->appName = $AppName;
         $this->config = $config;
         $this->logger = $logger;
@@ -99,10 +100,12 @@ class Properties implements \ArrayAccess
         foreach ($params as $param) {
             $value = $this->config->getAppValue($this->appName, $param, null);
 
-            if ($value === App::FALSE_VALUE) {
-                $value = false;
-            } elseif ($value === App::TRUE_VALUE) {
-                $value = true;
+            if ($this->isBooleanParam($param)) {
+                if ($value === App::FALSE_VALUE) {
+                    $value = false;
+                } elseif ($value === App::TRUE_VALUE) {
+                    $value = true;
+                }
             }
 
             $this->data[$param] = $value;
@@ -116,6 +119,24 @@ class Properties implements \ArrayAccess
         );
     }
 
+    /**
+     * Is given parameter a boolean parameter.
+     *
+     * @param $param string Parameter name.
+     *
+     * @return bool Is a boolean parameter.
+     */
+    private function isBooleanParam($param)
+    {
+        return in_array(
+            $param, [
+                Opt::APPEND_SALT, Opt::CASE_INSENSITIVE_USERNAME,
+                Opt::NAME_CHANGE, Opt::PASSWORD_CHANGE, Opt::PREPEND_SALT,
+                Opt::REVERSE_ACTIVE, Opt::USE_CACHE
+            ]
+        );
+    }
+
     /**
      * Return an array with all supported parameters.
      *
@@ -186,10 +207,12 @@ class Properties implements \ArrayAccess
     {
         $this->config->setAppValue($this->appName, $offset, $value);
 
-        if ($value === App::FALSE_VALUE) {
-            $value = false;
-        } elseif ($value === App::TRUE_VALUE) {
-            $value = true;
+        if ($this->isBooleanParam($offset)) {
+            if ($value === App::FALSE_VALUE) {
+                $value = false;
+            } elseif ($value === App::TRUE_VALUE) {
+                $value = true;
+            }
         }
 
         $this->data[$offset] = $value;