diff --git a/admin/class-variable-inspector-admin.php b/admin/class-variable-inspector-admin.php
index 129e2a6..8d69156 100644
--- a/admin/class-variable-inspector-admin.php
+++ b/admin/class-variable-inspector-admin.php
@@ -239,12 +239,7 @@ public function vi_generate_sample_results()
         // $backtrace = debug_backtrace();
         // do_action( 'inspect', [ 'backtrace', $backtrace, __FILE__, __LINE__ ] );
         global  $current_user, $wp_roles, $wp_post_types ;
-        do_action( 'inspect', [
-            'wp_post_types',
-            $wp_post_types,
-            __FILE__,
-            __LINE__
-        ] );
+        // do_action( 'inspect', [ 'wp_post_types', $wp_post_types, __FILE__, __LINE__ ] );
         // do_action( 'inspect', [ 'wp_roles', $wp_roles, __FILE__, __LINE__ ] );
         do_action( 'inspect', [
             'current_user',
@@ -386,6 +381,10 @@ public function vi_inspection_results()
                 case 'object':
                     $variable_content = (object) maybe_unserialize( $variable['content'] );
                     break;
+                case 'NULL':
+                    $variable_type = 'null';
+                    $variable_content = NULL;
+                    break;
             }
             $variable_category = ( $variable['category'] ? $variable['category'] : 'gray' );
             $variable_notes = $variable['extra'];
@@ -419,7 +418,7 @@ public function vi_inspection_results()
             $output .= '<div class="accordion inspection-accordion">';
             $output .= '<div class="accordion__control"><span class="variable-type">' . esc_html( $variable_type ) . '</span><span class="variable-name">' . esc_html( $variable_name ) . '</span><span class="variable-notes">' . esc_html( $variable_notes ) . '</span><span class="accordion__indicator"></span></div>';
             $output .= '
-                        <div id="' . esc_html( $identifier ) . '" class="accordion__panel">
+                        <div id="' . esc_attr( $identifier ) . '" class="accordion__panel">
                             <div class="functions">
                                 <a class="item" data-tab="var_export">var_export</a>' . $separator . '
                                 <a class="item" data-tab="var_dump">var_dump</a>' . $separator . '
@@ -497,16 +496,19 @@ public function vi_create_main_page()
                     
                     <?php 
         // Free version code
+        // Free version code
+        ?>
+                        <a href="https://bowo.io/vi-fdbk" target="_blank" class="vi-header-action">✚ 
+                            <?php 
+        esc_html_e( 'Feedback', 'variable-inspector' );
+        ?>
+                        </a>
+                        <?php 
         ?>
                     
                     <a href="https://bowo.io/vi-rvw" target="_blank" class="vi-header-action"><span>★</span> 
                         <?php 
         esc_html_e( 'Review', 'variable-inspector' );
-        ?>
-                    </a>
-                    <a href="https://bowo.io/vi-fdbk" target="_blank" class="vi-header-action">✚ 
-                        <?php 
-        esc_html_e( 'Feedback', 'variable-inspector' );
         ?>
                     </a>
                                                                 
@@ -600,7 +602,7 @@ public function vi_create_main_page()
     public function vi_footer_text()
     {
         ?>
-        <a href="https://bowo.io/vi-dotorg" target="_blank">Variable Inspector</a> is on <a href="https://bowo.io/vi-gthb" target="_blank">github</a>
+        <a href="https://bowo.io/vi-dotorg" target="_blank">Variable Inspector</a> is on <a href="https://bowo.io/vi-gthb" target="_blank">github</a> | <a href="https://bowo.io/vi-chnglg" target="_blank">View changelog</a>
         <?php 
     }
     
@@ -609,9 +611,10 @@ public function vi_footer_text()
      * 
      * @since 2.0.0
      */
-    public function vi_footer_version_text()
+    public function vi_footer_version_text( $content )
     {
-        return 'Also by Bowo &#8594; <a href="https://bowo.io/vi-bw" target="_blank">WordPress Newsboard</a>: The latest from 100+ sources';
+        $content = 'Also by Bowo &#8594; <a href="https://bowo.io/vi-bw" target="_blank">WordPress Newsboard</a>: The latest from 100+ sources';
+        return $content;
     }
     
     /**