diff --git a/src/Resources/contao/dca/tl_article.php b/src/Resources/contao/dca/tl_article.php
index 279b6d5..6edaf84 100644
--- a/src/Resources/contao/dca/tl_article.php
+++ b/src/Resources/contao/dca/tl_article.php
@@ -15,7 +15,7 @@
     'sql'                     => "blob NULL"
 );
 
-$GLOBALS['TL_DCA']['tl_article']['fields']['cssID']['sql'] = "text NOT NULL default ''";
+$GLOBALS['TL_DCA']['tl_article']['fields']['cssID']['sql'] = "text NULL";
 
 $GLOBALS['TL_DCA']['tl_article']['config']['onload_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'addPalette');
 $GLOBALS['TL_DCA']['tl_article']['fields']['cssID']['load_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'onLoad');
diff --git a/src/Resources/contao/dca/tl_calendar_events.php b/src/Resources/contao/dca/tl_calendar_events.php
index 3a92272..76a3033 100644
--- a/src/Resources/contao/dca/tl_calendar_events.php
+++ b/src/Resources/contao/dca/tl_calendar_events.php
@@ -19,7 +19,7 @@
         'sql'                     => "blob NULL"
     );
 
-    $GLOBALS['TL_DCA']['tl_calendar_events']['fields']['cssClass']['sql'] = "text NOT NULL default ''";
+    $GLOBALS['TL_DCA']['tl_calendar_events']['fields']['cssClass']['sql'] = "text NULL";
 
     $GLOBALS['TL_DCA']['tl_calendar_events']['config']['onload_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'addPalette');
     $GLOBALS['TL_DCA']['tl_calendar_events']['fields']['cssClass']['load_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'onLoad');
diff --git a/src/Resources/contao/dca/tl_content.php b/src/Resources/contao/dca/tl_content.php
index 3399d20..82d3a45 100644
--- a/src/Resources/contao/dca/tl_content.php
+++ b/src/Resources/contao/dca/tl_content.php
@@ -15,7 +15,7 @@
     'sql'                     => "blob NULL"
 );
 
-$GLOBALS['TL_DCA']['tl_content']['fields']['cssID']['sql'] = "text NOT NULL default ''";
+$GLOBALS['TL_DCA']['tl_content']['fields']['cssID']['sql'] = "text NULL";
 
 $GLOBALS['TL_DCA']['tl_content']['config']['onload_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'addPalette');
 $GLOBALS['TL_DCA']['tl_content']['fields']['cssID']['load_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'onLoad');
diff --git a/src/Resources/contao/dca/tl_form.php b/src/Resources/contao/dca/tl_form.php
index 0663301..d5ca2de 100644
--- a/src/Resources/contao/dca/tl_form.php
+++ b/src/Resources/contao/dca/tl_form.php
@@ -15,7 +15,7 @@
     'sql'                     => "blob NULL"
 );
 
-$GLOBALS['TL_DCA']['tl_form']['fields']['attributes']['sql'] = "text NOT NULL default ''";
+$GLOBALS['TL_DCA']['tl_form']['fields']['attributes']['sql'] = "text NULL";
 
 $GLOBALS['TL_DCA']['tl_form']['config']['onload_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'addPalette');
 $GLOBALS['TL_DCA']['tl_form']['fields']['attributes']['load_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'onLoad');
diff --git a/src/Resources/contao/dca/tl_form_field.php b/src/Resources/contao/dca/tl_form_field.php
index 5b21c6b..470da09 100644
--- a/src/Resources/contao/dca/tl_form_field.php
+++ b/src/Resources/contao/dca/tl_form_field.php
@@ -15,7 +15,7 @@
     'sql'                     => "blob NULL"
 );
 
-$GLOBALS['TL_DCA']['tl_form_field']['fields']['class']['sql'] = "text NOT NULL default ''";
+$GLOBALS['TL_DCA']['tl_form_field']['fields']['class']['sql'] = "text NULL";
 
 $GLOBALS['TL_DCA']['tl_form_field']['config']['onload_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'addPalette');
 $GLOBALS['TL_DCA']['tl_form_field']['list']['sorting']['child_record_callback'] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'listFormFields');
diff --git a/src/Resources/contao/dca/tl_layout.php b/src/Resources/contao/dca/tl_layout.php
index 20bb0ec..d07c600 100644
--- a/src/Resources/contao/dca/tl_layout.php
+++ b/src/Resources/contao/dca/tl_layout.php
@@ -15,7 +15,7 @@
     'sql'                     => "blob NULL"
 );
 
-$GLOBALS['TL_DCA']['tl_layout']['fields']['cssClass']['sql'] = "text NOT NULL default ''";
+$GLOBALS['TL_DCA']['tl_layout']['fields']['cssClass']['sql'] = "text NULL";
 
 $GLOBALS['TL_DCA']['tl_layout']['config']['onload_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'addPalette');
 $GLOBALS['TL_DCA']['tl_layout']['fields']['cssClass']['load_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'onLoad');
diff --git a/src/Resources/contao/dca/tl_module.php b/src/Resources/contao/dca/tl_module.php
index 5f4bd87..78444c5 100644
--- a/src/Resources/contao/dca/tl_module.php
+++ b/src/Resources/contao/dca/tl_module.php
@@ -15,7 +15,7 @@
     'sql'                     => "blob NULL"
 );
 
-$GLOBALS['TL_DCA']['tl_module']['fields']['cssID']['sql'] = "text NOT NULL default ''";
+$GLOBALS['TL_DCA']['tl_module']['fields']['cssID']['sql'] = "text NULL";
 
 $GLOBALS['TL_DCA']['tl_module']['config']['onload_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'addPalette');
 $GLOBALS['TL_DCA']['tl_module']['fields']['cssID']['load_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'onLoad');
diff --git a/src/Resources/contao/dca/tl_news.php b/src/Resources/contao/dca/tl_news.php
index 23c53f6..8b77d5a 100644
--- a/src/Resources/contao/dca/tl_news.php
+++ b/src/Resources/contao/dca/tl_news.php
@@ -19,7 +19,7 @@
         'sql'                     => "blob NULL"
     );
 
-    $GLOBALS['TL_DCA']['tl_news']['fields']['cssClass']['sql'] = "text NOT NULL default ''";
+    $GLOBALS['TL_DCA']['tl_news']['fields']['cssClass']['sql'] = "text NULL";
 
     $GLOBALS['TL_DCA']['tl_news']['config']['onload_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'addPalette');
     $GLOBALS['TL_DCA']['tl_news']['fields']['cssClass']['load_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'onLoad');
diff --git a/src/Resources/contao/dca/tl_page.php b/src/Resources/contao/dca/tl_page.php
index f5d0643..c291f31 100644
--- a/src/Resources/contao/dca/tl_page.php
+++ b/src/Resources/contao/dca/tl_page.php
@@ -15,7 +15,7 @@
     'sql'                     => "blob NULL"
 );
 
-$GLOBALS['TL_DCA']['tl_page']['fields']['cssClass']['sql'] = "text NOT NULL default ''";
+$GLOBALS['TL_DCA']['tl_page']['fields']['cssClass']['sql'] = "text NULL";
 
 $GLOBALS['TL_DCA']['tl_page']['config']['onload_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'addPalette');
 $GLOBALS['TL_DCA']['tl_page']['fields']['cssClass']['load_callback'][] = array('\\Oveleon\\ContaoComponentStyleManager\\StyleManager', 'onLoad');