diff --git a/Classes/Domain/Index/TcaIndexer/RelationResolver.php b/Classes/Domain/Index/TcaIndexer/RelationResolver.php
index ae10f68..e992577 100644
--- a/Classes/Domain/Index/TcaIndexer/RelationResolver.php
+++ b/Classes/Domain/Index/TcaIndexer/RelationResolver.php
@@ -41,14 +41,7 @@ class RelationResolver implements Singleton
                 continue;
             }
 
-            $record[$column] = GeneralUtility::makeInstance($this->getUtilityForMode())
-                ::getProcessedValueExtra(
-                    $service->getTableName(),
-                    $column,
-                    $record[$column],
-                    0,
-                    $record['uid']
-                );
+            $record[$column] = $this->getColumnValue($record, $column, $service);
 
             try {
                 $config = $service->getColumnConfig($column);
@@ -107,4 +100,16 @@ class RelationResolver implements Singleton
 
         return FrontendUtility::class;
     }
+
+    protected function getColumnValue(array $record, string $column, TcaTableServiceInterface $service): string
+    {
+        $utility = GeneralUtility::makeInstance($this->getUtilityForMode());
+        return $utility::getProcessedValueExtra(
+            $service->getTableName(),
+            $column,
+            $record[$column],
+            0,
+            $record['uid']
+        ) ?? '';
+    }
 }
diff --git a/Documentation/source/conf.py b/Documentation/source/conf.py
index 054c7b8..2e2632b 100644
--- a/Documentation/source/conf.py
+++ b/Documentation/source/conf.py
@@ -59,9 +59,9 @@ author = u'Daniel Siepmann'
 # built documents.
 #
 # The short X.Y version.
-version = u'0.0.4'
+version = u'0.0.6'
 # The full version, including alpha/beta/rc tags.
-release = u'0.0.4'
+release = u'0.0.6'
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 #
@@ -132,7 +132,7 @@ html_theme_options = {
 
 # The name for this set of Sphinx documents.
 # "<project> v<release> documentation" by default.
-#html_title = u'TYPO3 Extension search_core v0.0.4'
+#html_title = u'TYPO3 Extension search_core v0.0.6'
 
 # A shorter title for the navigation bar.  Default is the same as html_title.
 #html_short_title = None
diff --git a/Documentation/source/installation.rst b/Documentation/source/installation.rst
index fc9b479..acd56d7 100644
--- a/Documentation/source/installation.rst
+++ b/Documentation/source/installation.rst
@@ -9,7 +9,7 @@ Composer
 
 The extension can be installed through composer::
 
-    composer require "codappix/search_core" "~0.0.4"
+    composer require "codappix/search_core" "~0.0.6"
 
 Note that you have to allow unstable packages:
 
diff --git a/ext_emconf.php b/ext_emconf.php
index b0b5e65..a21c748 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -18,7 +18,7 @@ $EM_CONF[$_EXTKEY] = [
         ],
     ],
     'state' => 'beta',
-    'version' => '0.0.4',
+    'version' => '0.0.6',
     'author' => 'Daniel Siepmann',
     'author_email' => 'coding@daniel-siepmann.de',
 ];