diff --git a/src/main/kotlin/com/aitrainer/api/controller/CustomerController.kt b/src/main/kotlin/com/aitrainer/api/controller/CustomerController.kt
index 111b28e..f63445a 100644
--- a/src/main/kotlin/com/aitrainer/api/controller/CustomerController.kt
+++ b/src/main/kotlin/com/aitrainer/api/controller/CustomerController.kt
@@ -126,6 +126,9 @@ class CustomerController ( private val customerRepository: CustomerRepository) {
         if (newCustomer.firebaseRegToken != null) {
             updatedCustomer.firebaseRegToken = newCustomer.firebaseRegToken
         }
+        if (newCustomer.lang != null) {
+            updatedCustomer.lang = newCustomer.lang
+        }
         updatedCustomer.sex = newCustomer.sex
         updatedCustomer.birthYear = newCustomer.birthYear
         updatedCustomer.fitnessLevel = newCustomer.fitnessLevel
diff --git a/src/test/kotlin/com/aitrainer/api/test/CustomerTests.kt b/src/test/kotlin/com/aitrainer/api/test/CustomerTests.kt
index 0d7344b..fb33cd8 100644
--- a/src/test/kotlin/com/aitrainer/api/test/CustomerTests.kt
+++ b/src/test/kotlin/com/aitrainer/api/test/CustomerTests.kt
@@ -117,6 +117,7 @@ class CustomerTests {
         customer.firebaseRegToken = "123456789asdfghjkl"
         customer.phone = "123456"
         customer.lifeLong = 1
+        customer.lang = "de"
 
 
         var updatedCustomer = customerRepository.save(customer)
@@ -130,6 +131,7 @@ class CustomerTests {
         assertEquals(updatedCustomer.firebaseRegToken, "123456789asdfghjkl")
         assertEquals(updatedCustomer.phone, "123456")
         assertEquals(updatedCustomer.lifeLong, 1)
+        assertEquals(updatedCustomer.lang, "de")
 
 
         customer.email = "sw@andio.biz"