diff --git a/README.md b/README.md
index 4449ffa..af2cdb1 100644
--- a/README.md
+++ b/README.md
@@ -790,13 +790,14 @@ Aktiviert die Schuko-Steckdose der Wallbox $WallboxId (von 0 bis 7) der E3DC-Ins
 
 ### 8. Versionshistorie
 
-#### v1.6 patch 1, 25.02.2022
+#### v1.6 patch 2, 26.02.2022
 - Register für Wechselrichter hinzugefügt (ab SW-Version >=S10_2022_02) 
 - Maximal nutzbare Batteriekapazität konfigurierbar (Alterung kann berücksichtigt werden)
 - DC-String Information einzeln aktivierbar
 - kW Wert zu DC-String Information hinzugefügt
 - Layout des Konfigurationsformulars überarbeitet
 - Bugfix #18: Uncaught TypeError getPowerSumOfLog()
+- Bugfix #20: Uncaught TypeError: deleteInstanceNotInUse()
 
 #### v1.5, 20.01.2022
 - bugfix #12: Wrong Modbus datatype used for powermeter values in W
diff --git a/e3dc/module.php b/e3dc/module.php
index cc7e624..85704e8 100644
--- a/e3dc/module.php
+++ b/e3dc/module.php
@@ -10,6 +10,7 @@
 if (!defined('MODUL_PREFIX'))
 {
 	define("MODUL_PREFIX", "E3DC");
+	define("MODUL_ID", "{C9508720-B23D-B37A-B5C2-97B607221CE1}");
 }
 
 // Offset von Register (erster Wert 1) zu Adresse (erster Wert 0) ist -1
@@ -218,7 +219,25 @@ public function Destroy()
 
 		public function GetConfigurationForm()
 		{
+			$libraryJson = @IPS_GetLibrary(MODUL_ID);
+			
+			$headline = MODUL_PREFIX." Modul";
+			if(isset($libraryJson['Version']))
+			{
+				$headline .= " v".$libraryJson['Version'];
+			}
+
+			if(isset($libraryJson['Date']) && 0 != $libraryJson['Date'])
+			{
+				$headline .= " (".$libraryJson['Date'].")";
+			}
+
 			$formElements = array();
+			$formElements[] = array(
+				'type' => "Label",
+				'label' => $headline,
+				'bold' => true,
+			);
 			$formElements[] = array(
 				'type' => "Label",
 				'label' => "Im E3DC Stromspeicher muss Modbus TCP aktiviert sein!",
diff --git a/libs/myFunctions.php b/libs/myFunctions.php
index 0b65263..d3ea839 100644
--- a/libs/myFunctions.php
+++ b/libs/myFunctions.php
@@ -172,7 +172,7 @@ private function deleteInstanceNotInUse(int $connectionId_Old, string $moduleId)
 			// Loesche Connection-Instanz (bspw. ModbusAddress, ClientSocket,...), wenn nicht mehr in Verwendung
 			if (!$inUse)
 			{
-				$returnValue &= IPS_DeleteInstance($connectionId_Old);
+				$returnValue = $returnValue && IPS_DeleteInstance($connectionId_Old);
 			}
 		}
 
@@ -352,16 +352,16 @@ private function createVarProfile(string $ProfilName, int $ProfileType, string $
 
 		if (!IPS_VariableProfileExists($ProfilName))
 		{
-			$returnValue &= IPS_CreateVariableProfile($ProfilName, $ProfileType);
-			$returnValue &= IPS_SetVariableProfileText($ProfilName, '', $Suffix);
+			$returnValue = $returnValue && IPS_CreateVariableProfile($ProfilName, $ProfileType);
+			$returnValue = $returnValue && IPS_SetVariableProfileText($ProfilName, '', $Suffix);
 
 			if (in_array($ProfileType, array(VARIABLETYPE_INTEGER, VARIABLETYPE_FLOAT)))
 			{
-				$returnValue &= IPS_SetVariableProfileValues($ProfilName, $MinValue, $MaxValue, $StepSize);
-				$returnValue &= IPS_SetVariableProfileDigits($ProfilName, $Digits);
+				$returnValue = $returnValue && IPS_SetVariableProfileValues($ProfilName, $MinValue, $MaxValue, $StepSize);
+				$returnValue = $returnValue && IPS_SetVariableProfileDigits($ProfilName, $Digits);
 			}
 
-			$returnValue &= IPS_SetVariableProfileIcon($ProfilName, $Icon);
+			$returnValue = $returnValue && IPS_SetVariableProfileIcon($ProfilName, $Icon);
 
 			foreach ($Associations as $a)
 			{
@@ -369,7 +369,7 @@ private function createVarProfile(string $ProfilName, int $ProfileType, string $
 				$n = isset($a['Name']) ? $a['Name'] : '';
 				$i = isset($a['Icon']) ? $a['Icon'] : '';
 				$f = isset($a['Farbe']) ? $a['Farbe'] : -1;
-				$returnValue &= IPS_SetVariableProfileAssociation($ProfilName, $w, $n, $i, $f);
+				$returnValue = $returnValue && IPS_SetVariableProfileAssociation($ProfilName, $w, $n, $i, $f);
 			}
 
 			$this->SendDebug("Variable-Profile", "Profile ".$ProfilName." created", 0);
@@ -392,7 +392,7 @@ private function deleteModbusInstancesRecursive(array $inverterModelRegister_arr
 			$instanceId = @IPS_GetObjectIDByIdent($register[IMR_START_REGISTER].$uniqueIdent, $categoryId);
 			if (false !== $instanceId)
 			{
-				$returnValue &= $this->deleteInstanceRecursive($instanceId);
+				$returnValue = $returnValue && $this->deleteInstanceRecursive($instanceId);
 
 				$this->SendDebug("delete Modbus address", "REG_".$register[IMR_START_REGISTER]." - ".$register[IMR_NAME].", ID=".$instanceId, 0);
 			}
@@ -406,9 +406,9 @@ private function deleteInstanceRecursive(int $instanceId): bool
 		$returnValue = true;
 		foreach (IPS_GetChildrenIDs($instanceId) as $childChildId)
 		{
-			$returnValue &= IPS_DeleteVariable($childChildId);
+			$returnValue = $returnValue && IPS_DeleteVariable($childChildId);
 		}
-		$returnValue &= IPS_DeleteInstance($instanceId);
+		$returnValue = $returnValue && IPS_DeleteInstance($instanceId);
 
 		return (bool)$returnValue;
 	}