diff --git a/app/models/user_device.rb b/app/models/user_device.rb
index 1ef721e48..8fccaf44f 100644
--- a/app/models/user_device.rb
+++ b/app/models/user_device.rb
@@ -236,7 +236,7 @@ check fingerprint string
 
   def self.fingerprint_validation(fingerprint)
     return true if fingerprint.blank?
-    raise Exceptions::UnprocessableEntity, "fingerprint is #{fingerprint.length} chars but can only be 160 chars!" if fingerprint.length > 160
+    raise Exceptions::UnprocessableEntity, "fingerprint is #{fingerprint.to_s.length} chars but can only be 160 chars!" if fingerprint.to_s.length > 160
     true
   end
 
diff --git a/test/integration/user_device_controller_test.rb b/test/integration/user_device_controller_test.rb
index 99407dba1..28bf37394 100644
--- a/test/integration/user_device_controller_test.rb
+++ b/test/integration/user_device_controller_test.rb
@@ -506,7 +506,28 @@ class UserDeviceControllerTest < ActionDispatch::IntegrationTest
 
   end
 
-  test '12 - login form controller - check no user device logging' do
+  test '12 - login with integer as fingerprint' do
+
+    assert_equal(0, UserDevice.where(user_id: @admin.id).count)
+    assert_equal(0, email_notification_count('user_device_new', @admin.email))
+    assert_equal(0, email_notification_count('user_device_new_location', @admin.email))
+
+    params = { fingerprint: 123_456_789, username: 'user-device-admin', password: 'adminpw' }
+    post '/api/v1/signin', params: params.to_json, headers: @headers
+    assert_response(201)
+    result = JSON.parse(@response.body)
+    assert(123_456_789, controller.session[:user_device_fingerprint])
+
+    Scheduler.worker(true)
+
+    assert_equal(1, UserDevice.where(user_id: @admin.id).count)
+    assert_equal(0, email_notification_count('user_device_new', @admin.email))
+    assert_equal(0, email_notification_count('user_device_new_location', @admin.email))
+    assert_equal(result.class, Hash)
+    assert_nil(result['error'])
+  end
+
+  test '13 - login form controller - check no user device logging' do
 
     Setting.set('form_ticket_create', true)