diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3f3a759..b4ad721 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@
 
 Please see: https://github.com/psyreactor/sonarqube-ruby/releases
 
+### 1.2.1 (08/09/2020)
+
+- Fix
+  * Fix groups parameter validation
+
 ### 1.2.0 (03/09/2020)
 
 - New features
diff --git a/README.md b/README.md
index 8319d7b..4e6c20d 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@
 [documentation](https://www.rubydoc.info/gems/sonarqube/frames)
 
 Sonarqube is a Ruby wrapper and CLI for the Sonarqube API
-As of version `1.2.0` this gem only supports Sonarqube 7.9.
+As of version `1.2.1` this gem only supports Sonarqube 7.9.
 
 ## Installation
 
diff --git a/docs/client/groups.markdown b/docs/client/groups.markdown
index 7896adb..d2947aa 100644
--- a/docs/client/groups.markdown
+++ b/docs/client/groups.markdown
@@ -63,7 +63,7 @@ group = Sonarqube.add_member('AXQRcKrW9pRiZzanEJ2E', 'test-user')
 # => #<Sonarqube::ObjectifiedHash:46220 {hash: {}}
 group.to_hash.empty?
 # => true
-group = Sonarqube.add_member('AXQRcKrW9pRiZzanEJ2E', 'test-user', {name: 'sonar-groups'})
+group = Sonarqube.add_member(nil, 'test-user', {name: 'sonar-groups'})
 # => #<Sonarqube::ObjectifiedHash:46220 {hash: {}}
 group.to_hash.empty?
 # => true
diff --git a/lib/sonarqube/client/groups.rb b/lib/sonarqube/client/groups.rb
index 0c913a5..15a263c 100644
--- a/lib/sonarqube/client/groups.rb
+++ b/lib/sonarqube/client/groups.rb
@@ -79,7 +79,7 @@ class Sonarqube::Client
     # @option options [String] :name Optional name of group.
     # @return [Sonarqube::ObjectifiedHash]
     def add_member(id = nil, login = nil, options = {})
-      raise ArgumentError, 'Missing required parameters' if id.nil? || login.nil?
+      raise ArgumentError, 'Missing required parameters' if id.nil? && login.nil?
 
       post('/api/user_groups/add_user', body: { id: id, login: login }.merge!(options))
     end
@@ -97,7 +97,7 @@ class Sonarqube::Client
     # @option options [String] :name Optional name of group.
     # @return [Sonarqube::ObjectifiedHash]
     def remove_member(id = nil, login = nil, options = {})
-      raise ArgumentError, 'Missing required parameters' if id.nil? || login.nil?
+      raise ArgumentError, 'Missing required parameters' if id.nil? && login.nil?
 
       post('/api/user_groups/remove_user', body: { id: id, login: login }.merge!(options))
     end
diff --git a/lib/sonarqube/version.rb b/lib/sonarqube/version.rb
index 534bab2..aa86a51 100644
--- a/lib/sonarqube/version.rb
+++ b/lib/sonarqube/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Sonarqube
-  VERSION = '1.2.0'
+  VERSION = '1.2.1'
 end