diff --git a/lib/Froxlor/Api/ApiCommand.php b/lib/Froxlor/Api/ApiCommand.php
index 9b7dcc6e..065a9090 100644
--- a/lib/Froxlor/Api/ApiCommand.php
+++ b/lib/Froxlor/Api/ApiCommand.php
@@ -583,8 +583,12 @@ abstract class ApiCommand extends ApiParameter
 			"group" => $group,
 			"var" => $varname
 		), true, true);
+		$content = $default;
+		if ($result) {
+			$content = $result['value'] ?? $default;
+		}
 		// @fixme html_entity_decode
-		$content = html_entity_decode(\Froxlor\PhpHelper::replaceVariables((($result['value'] != '') ? $result['value'] : $default), $replace_arr));
+		$content = html_entity_decode(\Froxlor\PhpHelper::replaceVariables($content, $replace_arr));
 		return $content;
 	}
 
diff --git a/lib/Froxlor/Api/Commands/Admins.php b/lib/Froxlor/Api/Commands/Admins.php
index ab48ed42..dec4d09f 100644
--- a/lib/Froxlor/Api/Commands/Admins.php
+++ b/lib/Froxlor/Api/Commands/Admins.php
@@ -265,7 +265,7 @@ class Admins extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\ResourceEnt
 				'login' => $loginname
 			), true, true);
 
-			if (strtolower($loginname_check['loginname']) == strtolower($loginname) || strtolower($loginname_check_admin['loginname']) == strtolower($loginname)) {
+			if (($loginname_check && strtolower($loginname_check['loginname']) == strtolower($loginname)) || ($loginname_check_admin && strtolower($loginname_check_admin['loginname']) == strtolower($loginname))) {
 				\Froxlor\UI\Response::standard_error('loginnameexists', $loginname, true);
 			} elseif (preg_match('/^' . preg_quote(Settings::Get('customer.accountprefix'), '/') . '([0-9]+)/', $loginname)) {
 				// Accounts which match systemaccounts are not allowed, filtering them
diff --git a/lib/Froxlor/Api/Commands/Customers.php b/lib/Froxlor/Api/Commands/Customers.php
index c7c0e2e8..cb815c92 100644
--- a/lib/Froxlor/Api/Commands/Customers.php
+++ b/lib/Froxlor/Api/Commands/Customers.php
@@ -411,7 +411,7 @@ class Customers extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\Resource
 					), true, true);
 
 					$mysql_maxlen = \Froxlor\Database\Database::getSqlUsernameLength() - strlen(Settings::Get('customer.mysqlprefix'));
-					if (strtolower($loginname_check['loginname']) == strtolower($loginname) || strtolower($loginname_check_admin['loginname']) == strtolower($loginname)) {
+					if (($loginname_check && strtolower($loginname_check['loginname']) == strtolower($loginname)) || ($loginname_check_admin && strtolower($loginname_check_admin['loginname']) == strtolower($loginname))) {
 						\Froxlor\UI\Response::standard_error('loginnameexists', $loginname, true);
 					} elseif (! \Froxlor\Validate\Validate::validateUsername($loginname, Settings::Get('panel.unix_names'), $mysql_maxlen)) {
 						if (strlen($loginname) > $mysql_maxlen) {
diff --git a/lib/Froxlor/Api/Commands/DirOptions.php b/lib/Froxlor/Api/Commands/DirOptions.php
index 2ce1a425..6da29a4c 100644
--- a/lib/Froxlor/Api/Commands/DirOptions.php
+++ b/lib/Froxlor/Api/Commands/DirOptions.php
@@ -96,7 +96,7 @@ class DirOptions extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\Resourc
 		), true, true);
 
 		// duplicate check
-		if ($path_dupe_check['path'] == $path) {
+		if ($path_dupe_check && $path_dupe_check['path'] == $path) {
 			\Froxlor\UI\Response::standard_error('errordocpathdupe', $userpath, true);
 		}
 
@@ -309,8 +309,7 @@ class DirOptions extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\Resourc
 		$query_fields = array();
 		$result_stmt = Database::prepare("
 			SELECT * FROM `" . TABLE_PANEL_HTACCESS . "`
-			WHERE `customerid` IN (" . implode(', ', $customer_ids) . ")" . $this->getSearchWhere($query_fields, true) . $this->getOrderBy() . $this->getLimit()
-		);
+			WHERE `customerid` IN (" . implode(', ', $customer_ids) . ")" . $this->getSearchWhere($query_fields, true) . $this->getOrderBy() . $this->getLimit());
 		Database::pexecute($result_stmt, $query_fields, true, true);
 		while ($row = $result_stmt->fetch(\PDO::FETCH_ASSOC)) {
 			$result[] = $row;
diff --git a/lib/Froxlor/Api/Commands/DirProtections.php b/lib/Froxlor/Api/Commands/DirProtections.php
index c609c377..04b48e69 100644
--- a/lib/Froxlor/Api/Commands/DirProtections.php
+++ b/lib/Froxlor/Api/Commands/DirProtections.php
@@ -81,7 +81,7 @@ class DirProtections extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\Res
 		$password_enc = \Froxlor\System\Crypt::makeCryptPassword($password, true);
 
 		// duplicate check
-		if ($username_path_check['username'] == $username && $username_path_check['path'] == $path) {
+		if ($username_path_check && $username_path_check['username'] == $username && $username_path_check['path'] == $path) {
 			\Froxlor\UI\Response::standard_error('userpathcombinationdupe', '', true);
 		} elseif ($password == $username) {
 			\Froxlor\UI\Response::standard_error('passwordshouldnotbeusername', '', true);
diff --git a/lib/Froxlor/Api/Commands/Domains.php b/lib/Froxlor/Api/Commands/Domains.php
index f65c882c..84e72a53 100644
--- a/lib/Froxlor/Api/Commands/Domains.php
+++ b/lib/Froxlor/Api/Commands/Domains.php
@@ -674,9 +674,9 @@ class Domains extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\ResourceEn
 					), '', true);
 				} elseif ($customerid == 0) {
 					\Froxlor\UI\Response::standard_error('adduserfirst', '', true);
-				} elseif (strtolower($domain_check['domain']) == strtolower($domain)) {
+				} elseif ($domain_check && strtolower($domain_check['domain']) == strtolower($domain)) {
 					\Froxlor\UI\Response::standard_error('domainalreadyexists', $idna_convert->decode($domain), true);
-				} elseif ($aliasdomain_check['id'] != $aliasdomain) {
+				} elseif ($aliasdomain_check && $aliasdomain_check['id'] != $aliasdomain) {
 					\Froxlor\UI\Response::standard_error('domainisaliasorothercustomer', '', true);
 				} else {
 					$wwwserveralias = ($serveraliasoption == '1') ? '1' : '0';
diff --git a/lib/Froxlor/Api/Commands/IpsAndPorts.php b/lib/Froxlor/Api/Commands/IpsAndPorts.php
index 73df49b1..3759c6b9 100644
--- a/lib/Froxlor/Api/Commands/IpsAndPorts.php
+++ b/lib/Froxlor/Api/Commands/IpsAndPorts.php
@@ -255,7 +255,7 @@ class IpsAndPorts extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\Resour
 				'port' => $port
 			));
 
-			if ($result_checkfordouble['id'] != '') {
+			if ($result_checkfordouble && $result_checkfordouble['id'] != '') {
 				\Froxlor\UI\Response::standard_error('myipnotdouble', '', true);
 			}
 
@@ -462,9 +462,9 @@ class IpsAndPorts extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\Resour
 				$docroot = '';
 			}
 
-			if ($result['ip'] != $ip && $result['ip'] == Settings::Get('system.ipaddress') && $result_sameipotherport['id'] == '') {
+			if ($result['ip'] != $ip && $result['ip'] == Settings::Get('system.ipaddress') && ($result_sameipotherport && $result_sameipotherport['id'] == '')) {
 				\Froxlor\UI\Response::standard_error('cantchangesystemip', '', true);
-			} elseif ($result_checkfordouble['id'] != '' && $result_checkfordouble['id'] != $id) {
+			} elseif ($result_checkfordouble && $result_checkfordouble['id'] != '' && $result_checkfordouble['id'] != $id) {
 				\Froxlor\UI\Response::standard_error('myipnotdouble', '', true);
 			} else {
 
@@ -560,7 +560,7 @@ class IpsAndPorts extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\Resour
 						'ip' => $result['ip']
 					));
 
-					if (($result['ip'] != Settings::Get('system.ipaddress')) || ($result['ip'] == Settings::Get('system.ipaddress') && $result_sameipotherport['id'] != '')) {
+					if (($result['ip'] != Settings::Get('system.ipaddress')) || ($result['ip'] == Settings::Get('system.ipaddress') && ($result_sameipotherport && $result_sameipotherport['id'] != ''))) {
 
 						$del_stmt = Database::prepare("
 							DELETE FROM `" . TABLE_PANEL_IPSANDPORTS . "`
diff --git a/lib/Froxlor/Api/Commands/Mysqls.php b/lib/Froxlor/Api/Commands/Mysqls.php
index 60ed33c1..f9fd1b41 100644
--- a/lib/Froxlor/Api/Commands/Mysqls.php
+++ b/lib/Froxlor/Api/Commands/Mysqls.php
@@ -252,7 +252,7 @@ class Mysqls extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\ResourceEnt
 			), true, true);
 			$mbdata = $mbdata_stmt->fetch(\PDO::FETCH_ASSOC);
 			Database::needRoot(false);
-			$result['size'] = $mbdata['MB'];
+			$result['size'] = $mbdata['MB'] ?? 0;
 			$this->logger()->logAction($this->isAdmin() ? \Froxlor\FroxlorLogger::ADM_ACTION : \Froxlor\FroxlorLogger::USR_ACTION, LOG_NOTICE, "[API] get database '" . $result['databasename'] . "'");
 			return $this->response(200, "successfull", $result);
 		}
@@ -411,7 +411,7 @@ class Mysqls extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\ResourceEnt
 						"table_schema" => $row['databasename']
 					), true, true);
 					$mbdata = $mbdata_stmt->fetch(\PDO::FETCH_ASSOC);
-					$row['size'] = $mbdata['MB'];
+					$row['size'] = $mbdata['MB'] ?? 0;
 					$result[] = $row;
 				}
 				Database::needRoot(false);
diff --git a/lib/Froxlor/Api/Commands/PhpSettings.php b/lib/Froxlor/Api/Commands/PhpSettings.php
index c43c25ff..a77d8e02 100644
--- a/lib/Froxlor/Api/Commands/PhpSettings.php
+++ b/lib/Froxlor/Api/Commands/PhpSettings.php
@@ -50,8 +50,7 @@ class PhpSettings extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\Resour
 			$result_stmt = Database::prepare("
 				SELECT c.*, fd.description as fpmdesc
 				FROM `" . TABLE_PANEL_PHPCONFIGS . "` c
-				LEFT JOIN `" . TABLE_PANEL_FPMDAEMONS . "` fd ON fd.id = c.fpmsettingid" . $this->getSearchWhere($query_fields) . $this->getOrderBy() . $this->getLimit()
-			);
+				LEFT JOIN `" . TABLE_PANEL_FPMDAEMONS . "` fd ON fd.id = c.fpmsettingid" . $this->getSearchWhere($query_fields) . $this->getOrderBy() . $this->getLimit());
 			Database::pexecute($result_stmt, $query_fields, true, true);
 			$phpconfigs = array();
 			while ($row = $result_stmt->fetch(\PDO::FETCH_ASSOC)) {
diff --git a/lib/Froxlor/Api/Commands/SubDomains.php b/lib/Froxlor/Api/Commands/SubDomains.php
index 73cd7772..91addb6d 100644
--- a/lib/Froxlor/Api/Commands/SubDomains.php
+++ b/lib/Froxlor/Api/Commands/SubDomains.php
@@ -195,7 +195,7 @@ class SubDomains extends \Froxlor\Api\ApiCommand implements \Froxlor\Api\Resourc
 			} elseif ($subdomain == 'www' && $domain_check['wwwserveralias'] == '1') {
 				// you cannot add 'www' as subdomain when the maindomain generates a www-alias
 				\Froxlor\UI\Response::standard_error('wwwnotallowed', '', true);
-			} elseif (strtolower($completedomain_check['domain']) == strtolower($completedomain)) {
+			} elseif ($completedomain_check && strtolower($completedomain_check['domain']) == strtolower($completedomain)) {
 				// the domain does already exist as main-domain
 				\Froxlor\UI\Response::standard_error('domainexistalready', $completedomain, true);
 			}
diff --git a/lib/Froxlor/Settings/FroxlorVhostSettings.php b/lib/Froxlor/Settings/FroxlorVhostSettings.php
index 5ed2502c..6c4068ec 100644
--- a/lib/Froxlor/Settings/FroxlorVhostSettings.php
+++ b/lib/Froxlor/Settings/FroxlorVhostSettings.php
@@ -12,5 +12,4 @@ class FroxlorVhostSettings
 		$result = Database::pexecute_first($sel_stmt);
 		return $result['vcentries'] > 0 ? true : false;
 	}
-
 }