diff --git a/app/services/emoji_react_service.rb b/app/services/emoji_react_service.rb
index 5e30e005d6cafa..f8bc622d1f782f 100644
--- a/app/services/emoji_react_service.rb
+++ b/app/services/emoji_react_service.rb
@@ -17,14 +17,14 @@ def call(account, status, name)
     @status = status
 
     with_redis_lock("emoji_reaction:#{status.id}") do
-      @emoji_reaction = EmojiReaction.find_by(account: account, status: status, name: name)
-      raise Mastodon::ValidationError, I18n.t('reactions.errors.duplication') unless @emoji_reaction.nil?
-
       shortcode, domain = name.split('@')
       domain = nil if TagManager.instance.local_domain?(domain)
       custom_emoji = CustomEmoji.find_by(shortcode: shortcode, domain: domain)
       return if domain.present? && !EmojiReaction.exists?(status: status, custom_emoji: custom_emoji)
 
+      @emoji_reaction = EmojiReaction.find_by(account: account, status: status, name: shortcode, custom_emoji: custom_emoji)
+      raise Mastodon::ValidationError, I18n.t('reactions.errors.duplication') unless @emoji_reaction.nil?
+
       @emoji_reaction = EmojiReaction.create!(account: account, status: status, name: shortcode, custom_emoji: custom_emoji)
 
       status.touch # rubocop:disable Rails/SkipsModelValidations
diff --git a/spec/services/emoji_react_service_spec.rb b/spec/services/emoji_react_service_spec.rb
index bf03eb5bf8cda3..8ba0466ef111e5 100644
--- a/spec/services/emoji_react_service_spec.rb
+++ b/spec/services/emoji_react_service_spec.rb
@@ -19,15 +19,6 @@
     expect(subject.first.custom_emoji_id).to be_nil
   end
 
-  context 'with name duplication on same account' do
-    before { Fabricate(:emoji_reaction, status: status, name: '😀') }
-
-    it 'react with emoji' do
-      expect(subject.count).to eq 1
-      expect(subject.first.name).to eq '😀'
-    end
-  end
-
   context 'when multiple reactions by same account' do
     let(:name) { '😂' }
 
@@ -139,6 +130,37 @@
     end
   end
 
+  context 'with name duplication of unicode emoji on same account' do
+    before { Fabricate(:emoji_reaction, status: status, name: '😀') }
+
+    it 'react with emoji' do
+      expect(subject.count).to eq 1
+      expect(subject.first.name).to eq '😀'
+    end
+  end
+
+  context 'with name duplication of local cuetom emoji on same account' do
+    let(:name) { 'ohagi' }
+    let!(:custom_emoji) { Fabricate(:custom_emoji, shortcode: 'ohagi') }
+
+    before { Fabricate(:emoji_reaction, account: sender, status: status, name: 'ohagi', custom_emoji: custom_emoji) }
+
+    it 'react with emoji' do
+      expect { subject.count }.to raise_error Mastodon::ValidationError
+    end
+  end
+
+  context 'with name duplication of remote cuetom emoji on same account' do
+    let(:name) { 'ohagi@foo.bar' }
+    let!(:custom_emoji) { Fabricate(:custom_emoji, shortcode: 'ohagi', domain: 'foo.bar', uri: 'https://foo.bar/emoji/ohagi') }
+
+    before { Fabricate(:emoji_reaction, account: sender, status: status, name: 'ohagi', custom_emoji: custom_emoji) }
+
+    it 'react with emoji' do
+      expect { subject.count }.to raise_error Mastodon::ValidationError
+    end
+  end
+
   context 'when has remote followers' do
     let!(:bob) { Fabricate(:account, domain: 'foo.bar', uri: 'https://foo.bar/actor', inbox_url: 'https://foo.bar/inbox', protocol: 'activitypub') }