diff --git a/Classes/Controller/PluginController.php b/Classes/Controller/PluginController.php
index fd24142..6521e17 100644
--- a/Classes/Controller/PluginController.php
+++ b/Classes/Controller/PluginController.php
@@ -327,7 +327,15 @@ private function extractGroup($record_ids)
         $records = [];
         foreach ($record_ids as $table => $items) {
             $tc = $tables[$table] ?? [];
-            $connection = $this->connectionPool->getConnectionForTable($table);
+            $connection = $this->connectionPool
+                ->getConnectionForTable($table)
+                ->getSchemaManager()
+                ->tablesExist([$table]);
+
+            // table seems not available --> break to avoid exceptions
+            if ($connection === false) {
+                break;
+            }
             foreach ($items as $item) {
                 $item = intval($item);
 
diff --git a/Classes/Div.php b/Classes/Div.php
index da06396..b1b0bf1 100644
--- a/Classes/Div.php
+++ b/Classes/Div.php
@@ -520,7 +520,7 @@ public static function getTableConfig($table = false)
             ]
         ];
 
-        // load configuration for tt_address only if extension is loaded
+        // load configuration for calendarize only if extension is loaded
         if (ExtensionManagementUtility::isLoaded('calendarize')) {
             $tables['tx_calendarize_domain_model_event'] = [
                 'FORMAT' => '%01.6f',
@@ -561,16 +561,4 @@ protected static function getLogger()
         return $loggerManager->getLogger(static::class);
     }
 
-
-
-    public function isExtensionLoaded($params = [])
-    {
-        $isLoaded = false;
-
-        if ( ExtensionManagementUtility::isLoaded('tt_address') ) {
-            $isLoaded = true;
-        }
-
-        return $isLoaded;
-    }
 }
diff --git a/Configuration/Flexform/flexform_basic.xml b/Configuration/Flexform/flexform_basic.xml
index 7db3f45..86ae8e4 100644
--- a/Configuration/Flexform/flexform_basic.xml
+++ b/Configuration/Flexform/flexform_basic.xml
@@ -13,10 +13,11 @@
 					<marker>
 						<TCEforms>
 							<label>LLL:EXT:ods_osm/Resources/Private/Language/locallang_db.xlf:tt_content.pi_flexform.marker</label>
+							<description>LLL:EXT:ods_osm/Resources/Private/Language/locallang_db.xlf:tt_content.pi_flexform.marker.description</description>
 							<config>
 								<type>group</type>
 								<internal_type>db</internal_type>
-                                <allowed>fe_groups,fe_users,pages,sys_category,tx_odsosm_track,tx_odsosm_vector,tt_address,tx_calendarize_domain_model_event</allowed>
+                                <allowed>fe_groups,fe_users,pages,sys_category,tx_odsosm_track,tx_odsosm_vector,*</allowed>
 								<size>5</size>
 								<minitems>0</minitems>
 								<maxitems>9999</maxitems>
@@ -303,11 +304,13 @@
 					<marker_popup_initial>
 						<TCEforms>
 							<label>LLL:EXT:ods_osm/Resources/Private/Language/locallang_db.xlf:tt_content.pi_flexform.marker_popup_intial</label>
+							<description>LLL:EXT:ods_osm/Resources/Private/Language/locallang_db.xlf:tt_content.pi_flexform.marker_popup_intial.description</description>
 							<displayCond>FIELD:show_popups:IN:1,3</displayCond>
 							<config>
 								<type>group</type>
 								<internal_type>db</internal_type>
-								<allowed>fe_users,tt_address</allowed>
+								<allowed>fe_users,*</allowed>
+								<prepend_tname>1</prepend_tname>
 								<size>1</size>
 								<minitems>0</minitems>
 								<maxitems>1</maxitems>
diff --git a/Configuration/TCA/Overrides/tt_content.php b/Configuration/TCA/Overrides/tt_content.php
index 8dbb16b..3b19967 100644
--- a/Configuration/TCA/Overrides/tt_content.php
+++ b/Configuration/TCA/Overrides/tt_content.php
@@ -23,21 +23,3 @@
 
 $GLOBALS['TCA']['tt_content']['types']['list']['subtypes_addlist']['ods_osm_pi1']     = 'pi_flexform';
 $GLOBALS['TCA']['tt_content']['types']['list']['subtypes_excludelist']['ods_osm_pi1'] = 'layout,select_key,pages,recursive';
-
-// Avoid PHP 8.1 errors due to not available index if extensions are not installed
-if (! ExtensionManagementUtility::isLoaded('tt_address')) {
-	$GLOBALS['TCA']['tt_address'] = [
-		'ctrl' => [
-			'title' => '',
-			'iconfile' => 'EXT:ods_osm/Resources/Public/Icons/osm.png'
-		]
-	];
-}
-if (! ExtensionManagementUtility::isLoaded('calendarize')) {
-	$GLOBALS['TCA']['tx_calendarize_domain_model_event'] = [
-		'ctrl' => [
-			'title' => '',
-			'iconfile' => 'EXT:ods_osm/Resources/Public/Icons/osm.png'
-		]
-	];
-}
diff --git a/Resources/Private/Language/de.locallang_db.xlf b/Resources/Private/Language/de.locallang_db.xlf
index c1e9573..a537b41 100644
--- a/Resources/Private/Language/de.locallang_db.xlf
+++ b/Resources/Private/Language/de.locallang_db.xlf
@@ -58,9 +58,13 @@
 				<target><![CDATA[Programm]]></target>
 			</trans-unit>
 			<trans-unit id="tt_content.pi_flexform.marker" approved="yes">
-				<source><![CDATA[Marker to show]]></source>
+				<source><![CDATA[Records to show]]></source>
 				<target><![CDATA[Markierungen anzeigen]]></target>
 			</trans-unit>
+			<trans-unit id="tt_content.pi_flexform.marker.description" approved="yes">
+				<source><![CDATA[Select marker, track or vector records to show on the map.]]></source>
+				<target><![CDATA[Marker, Track oder Vector-Daten für die Anzeige auf der Karte wählen.]]></target>
+			</trans-unit>
 			<trans-unit id="tt_content.pi_flexform.marker_popup_intial" approved="yes">
 				<source><![CDATA[Show this marker's popup initially]]></source>
 				<target><![CDATA[Markierungspopup anfangs anzeigen]]></target>
@@ -118,7 +122,7 @@
 			</trans-unit>
 			<trans-unit id="tt_content.pi_flexform.show_popups.I.0" approved="yes">
 				<source><![CDATA[No]]></source>
-				<target><![CDATA[NNein]]></target>
+				<target><![CDATA[Nein]]></target>
 			</trans-unit>
 			<trans-unit id="tt_content.pi_flexform.show_popups.I.1" approved="yes">
 				<source><![CDATA[Click]]></source>
diff --git a/Resources/Private/Language/locallang_db.xlf b/Resources/Private/Language/locallang_db.xlf
index f081e8a..6ef75f5 100644
--- a/Resources/Private/Language/locallang_db.xlf
+++ b/Resources/Private/Language/locallang_db.xlf
@@ -40,7 +40,10 @@
 				<source>Cluster markers</source>
 			</trans-unit>
 			<trans-unit id="tt_content.pi_flexform.marker" xml:space="preserve">
-				<source>Marker to show</source>
+				<source>Records to show</source>
+			</trans-unit>
+			<trans-unit id="tt_content.pi_flexform.marker.description" xml:space="preserve">
+				<source>Select marker, track or vector records to show on the map.</source>
 			</trans-unit>
 			<trans-unit id="tt_content.pi_flexform.marker_popup_intial" xml:space="preserve">
 				<source>Show this marker's popup initially</source>
diff --git a/ext_tables.sql b/ext_tables.sql
index 6fd1602..6592ef6 100644
--- a/ext_tables.sql
+++ b/ext_tables.sql
@@ -21,7 +21,7 @@ CREATE TABLE sys_category (
 );
 
 --
--- Table structure for table 'fe_users'
+-- Table structure for table 'tx_calendarize_domain_model_event'
 --
 CREATE TABLE tx_calendarize_domain_model_event (
 	tx_odsosm_lon decimal(9,6) NOT NULL DEFAULT '0.000000',