diff --git a/lib/classes/api/abstract.ApiCommand.php b/lib/classes/api/abstract.ApiCommand.php
index 1dafc054..f499140b 100644
--- a/lib/classes/api/abstract.ApiCommand.php
+++ b/lib/classes/api/abstract.ApiCommand.php
@@ -86,6 +86,12 @@ abstract class ApiCommand
 		}
 		$this->logger = FroxlorLogger::getInstanceOf($this->user_data);
 		
+		// check whether the user is deactivated
+		if ($this->getUserDetail('deactivated') == 1) {
+			$this->logger()->logAction(LOG_ERROR, LOG_INFO, "[API] User '" . $this->getUserDetail('loginnname') . "' tried to use API but is deactivated");
+			throw new Exception("Account suspended", 406);
+		}
+
 		$this->initLang();
 		$this->initMail();
 		
diff --git a/lib/classes/api/commands/class.Customers.php b/lib/classes/api/commands/class.Customers.php
index bc2fb55b..bfad0ba9 100644
--- a/lib/classes/api/commands/class.Customers.php
+++ b/lib/classes/api/commands/class.Customers.php
@@ -199,7 +199,7 @@ class Customers extends ApiCommand implements ResourceEntity
 					standard_error(array(
 						'stringisempty',
 						'myname'
-					));
+					), '', true);
 				} elseif ($firstname == '' && $company == '') {
 					standard_error(array(
 						'stringisempty',
@@ -756,23 +756,23 @@ class Customers extends ApiCommand implements ResourceEntity
 				standard_error(array(
 					'stringisempty',
 					'myname'
-				));
+				), '', true);
 			} elseif ($firstname == '' && $company == '') {
 				standard_error(array(
 					'stringisempty',
 					'myfirstname'
-				));
+				), '', true);
 			} elseif ($email == '') {
 				standard_error(array(
 					'stringisempty',
 					'emailadd'
-				));
+				), '', true);
 			} elseif (! validateEmail($email)) {
-				standard_error('emailiswrong', $email);
+				standard_error('emailiswrong', $email, true);
 			} else {
 				
 				if ($password != '') {
-					$password = validatePassword($password);
+					$password = validatePassword($password, true);
 					$password = makeCryptPassword($password);
 				} else {
 					$password = $result['password'];