diff --git a/src/Analyser/Header/Baidu.php b/src/Analyser/Header/Baidu.php
index 09607f86..6ef1eead 100644
--- a/src/Analyser/Header/Baidu.php
+++ b/src/Analyser/Header/Baidu.php
@@ -4,6 +4,8 @@
 
 class Baidu
 {
+    protected $data;
+
     public function __construct($header, &$data)
     {
         $this->data =& $data;
diff --git a/src/Analyser/Header/BrowserId.php b/src/Analyser/Header/BrowserId.php
index 6b57b76c..8cb6cf6a 100644
--- a/src/Analyser/Header/BrowserId.php
+++ b/src/Analyser/Header/BrowserId.php
@@ -9,6 +9,8 @@
 
 class BrowserId
 {
+    protected $data;
+
     public function __construct($header, &$data)
     {
         if ($header == 'XMLHttpRequest') {
diff --git a/src/Analyser/Header/OperaMini.php b/src/Analyser/Header/OperaMini.php
index d8525bdf..ecf264bb 100644
--- a/src/Analyser/Header/OperaMini.php
+++ b/src/Analyser/Header/OperaMini.php
@@ -7,6 +7,8 @@
 
 class OperaMini
 {
+    protected $data;
+
     public function __construct($header, &$data)
     {
         $this->data =& $data;
diff --git a/src/Analyser/Header/Puffin.php b/src/Analyser/Header/Puffin.php
index fdd34891..2ad4ed94 100644
--- a/src/Analyser/Header/Puffin.php
+++ b/src/Analyser/Header/Puffin.php
@@ -6,6 +6,8 @@
 
 class Puffin
 {
+    protected $data;
+
     public function __construct($header, &$data)
     {
         $this->data =& $data;
diff --git a/src/Analyser/Header/UCBrowserNew.php b/src/Analyser/Header/UCBrowserNew.php
index d3f20c72..4cc3df1a 100644
--- a/src/Analyser/Header/UCBrowserNew.php
+++ b/src/Analyser/Header/UCBrowserNew.php
@@ -8,6 +8,8 @@
 
 class UCBrowserNew
 {
+    protected $data;
+
     public function __construct($header, &$data)
     {
         $this->data =& $data;
diff --git a/src/Analyser/Header/UCBrowserOld.php b/src/Analyser/Header/UCBrowserOld.php
index 12caa9a1..3d90f4e9 100644
--- a/src/Analyser/Header/UCBrowserOld.php
+++ b/src/Analyser/Header/UCBrowserOld.php
@@ -7,6 +7,8 @@
 
 class UCBrowserOld
 {
+    protected $data;
+
     public function __construct($header, &$data)
     {
         $this->data =& $data;
diff --git a/src/Analyser/Header/Useragent.php b/src/Analyser/Header/Useragent.php
index ebfa2001..5a36287e 100644
--- a/src/Analyser/Header/Useragent.php
+++ b/src/Analyser/Header/Useragent.php
@@ -6,6 +6,9 @@ class Useragent
 {
     use Useragent\Os, Useragent\Device, Useragent\Browser, Useragent\Application, Useragent\Using, Useragent\Engine, Useragent\Bot;
 
+    protected $data;
+    protected $options;
+
     public function __construct($header, &$data, &$options)
     {
         $this->data =& $data;
diff --git a/src/Analyser/Header/Wap.php b/src/Analyser/Header/Wap.php
index 727feeeb..6174c487 100644
--- a/src/Analyser/Header/Wap.php
+++ b/src/Analyser/Header/Wap.php
@@ -7,6 +7,8 @@
 
 class Wap
 {
+    protected $data;
+
     public function __construct($header, &$data)
     {
         $this->data =& $data;