diff --git a/.travis.yml b/.travis.yml
index 08901f4..f4e4330 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,6 @@ language: ruby
 rvm:
   - 2.4.9
   - 2.6.5
-  - 2.7.0
 
 addons:
   postgresql: "9.4"
@@ -11,11 +10,6 @@ env:
   - REDMINE_VER=3.4-stable
   - REDMINE_VER=4.1-stable
 
-matrix:
-  exclude:
-  - rvm: 2.7.0
-    env: REDMINE_VER=3.4-stable
-
 install: "echo skip bundle install"
 
 before_script:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5aed2bf..aecc9f3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# 1.7.3
+
+* Fix None protocol
+* Fix conflict with redmineup/a_common_lib
+* Fix runtime error
+* Remove ruby 2.7.0 from build matrix
+
 # 1.7.2
 
 * Add API restriction option
diff --git a/init.rb b/init.rb
index 956cd05..d745455 100644
--- a/init.rb
+++ b/init.rb
@@ -17,7 +17,7 @@
 
 Redmine::Plugin.register :redmine_2fa do
   name 'Redmine 2FA'
-  version '1.7.2'
+  version '1.7.3'
   url 'https://github.com/southbridgeio/redmine_2fa'
   description 'Two-factor authorization for Redmine'
   author 'Southbridge'
diff --git a/lib/redmine_two_fa/patches/application_controller_patch.rb b/lib/redmine_two_fa/patches/application_controller_patch.rb
index f673fdf..ffd9cd7 100644
--- a/lib/redmine_two_fa/patches/application_controller_patch.rb
+++ b/lib/redmine_two_fa/patches/application_controller_patch.rb
@@ -7,4 +7,6 @@ def find_current_user
   end
 end
 
-ApplicationController.prepend(TwoFaApplicationControllerPatch)
+Rails.configuration.to_prepare do
+  ApplicationController.prepend(TwoFaApplicationControllerPatch)
+end
diff --git a/lib/redmine_two_fa/protocols/google_auth.rb b/lib/redmine_two_fa/protocols/google_auth.rb
index 10110df..5996a53 100644
--- a/lib/redmine_two_fa/protocols/google_auth.rb
+++ b/lib/redmine_two_fa/protocols/google_auth.rb
@@ -3,7 +3,7 @@ class GoogleAuth < BaseProtocol
     def generate_qr(user)
       qr_size ||= 10
       RQRCode::QRCode.new(user.provisioning_uri("#{user.login}", issuer: "#{Setting.host_name}"), size: qr_size, level: :h)
-    rescue RQRCode::QRCodeRunTimeError => e
+    rescue RQRCodeCore::QRCodeRunTimeError=> e
       retry unless (qr_size += 1) > 20
       raise e
     end
diff --git a/lib/redmine_two_fa/protocols/none.rb b/lib/redmine_two_fa/protocols/none.rb
index 1274f60..7240981 100644
--- a/lib/redmine_two_fa/protocols/none.rb
+++ b/lib/redmine_two_fa/protocols/none.rb
@@ -3,5 +3,9 @@ class None < BaseProtocol
     def bypass?
       true
     end
+
+    def initial_partial
+      'account/init_2fa/none'
+    end
   end
 end