diff --git a/api/src/controllers/UserController.kt b/api/src/controllers/UserController.kt
index 700df0a..717be2a 100644
--- a/api/src/controllers/UserController.kt
+++ b/api/src/controllers/UserController.kt
@@ -2,7 +2,9 @@ package be.vandewalleh.controllers
 
 import be.vandewalleh.auth.SimpleJWT
 import be.vandewalleh.auth.UsernamePasswordCredential
+import be.vandewalleh.errors.ApiError
 import io.ktor.application.call
+import io.ktor.http.HttpStatusCode
 import io.ktor.locations.Location
 import io.ktor.locations.post
 import io.ktor.request.receive
@@ -20,9 +22,9 @@ class UserController(kodein: Kodein) : KodeinController(kodein) {
 
             // TODO check db
             if (post.username != "test" || post.password != "test")
-                error("Invalid Credentials")
+                return@post call.respond(HttpStatusCode.BadRequest, ApiError.InvalidCredentialError())
 
-            call.respond(mapOf("token" to simpleJwt.sign("test@test.be")))
+            return@post call.respond(mapOf("token" to simpleJwt.sign("test@test.be")))
         }
     }
 
diff --git a/api/src/errors/Errors.kt b/api/src/errors/Errors.kt
new file mode 100644
index 0000000..8363139
--- /dev/null
+++ b/api/src/errors/Errors.kt
@@ -0,0 +1,5 @@
+package be.vandewalleh.errors
+
+sealed class ApiError(val message: String){
+    class InvalidCredentialError : ApiError("Invalid credentials")
+}