diff --git a/app/models/xudt_tag.rb b/app/models/xudt_tag.rb
index a2d226b2e..85a69c954 100644
--- a/app/models/xudt_tag.rb
+++ b/app/models/xudt_tag.rb
@@ -1,7 +1,7 @@
 class XudtTag < ApplicationRecord
   belongs_to :udt
 
-  VALID_TAGS = ["unnamed", "invalid", "suspicious", "out-of-length-range", "rgb++", "layer-1-asset", "supply-limited", "utility", "layer-2-asset", "supply-unlimited"]
+  VALID_TAGS = ["invalid", "suspicious", "out-of-length-range", "rgb++", "layer-1-asset", "supply-limited", "utility", "layer-2-asset", "supply-unlimited"]
 end
 
 # == Schema Information
diff --git a/app/workers/xudt_tag_worker.rb b/app/workers/xudt_tag_worker.rb
index f2e3a8cca..fe7ccd000 100644
--- a/app/workers/xudt_tag_worker.rb
+++ b/app/workers/xudt_tag_worker.rb
@@ -16,9 +16,7 @@ def perform
   end
 
   def mark_tags(udt)
-    if udt.symbol.blank?
-      ["unnamed"]
-    elsif invalid_char?(udt.symbol)
+    if invalid_char?(udt.symbol)
       ["invalid"]
     elsif invisible_char?(udt.symbol)
       ["suspicious"]
@@ -36,15 +34,15 @@ def mark_tags(udt)
   end
 
   def invalid_char?(symbol)
-    !symbol.ascii_only?
+    symbol.present? && !symbol.ascii_only?
   end
 
   def invisible_char?(symbol)
-    (symbol =~ /^[\x21-\x7E]+(?:\s[\x21-\x7E]+)?$/).nil?
+    symbol.present? && (symbol =~ /^[\x21-\x7E]+(?:\s[\x21-\x7E]+)?$/).nil?
   end
 
   def out_of_length?(symbol)
-    symbol.length > 60
+    symbol.present? && symbol.length > 60
   end
 
   def rgbpp_lock?(issuer_address)
diff --git a/test/workers/xudt_tag_worker_test.rb b/test/workers/xudt_tag_worker_test.rb
index 7ed795dfb..54a2549ed 100644
--- a/test/workers/xudt_tag_worker_test.rb
+++ b/test/workers/xudt_tag_worker_test.rb
@@ -5,20 +5,12 @@ class XudtTagWorkerTest < ActiveJob::TestCase
     @address = create(:address, address_hash: "ckb1qz7xc452rgxs5z0ks3xun46dmdp58sepg0ljtae8ck0d7nah945nvqgqqqqqqx3l3v4")
   end
 
-  test "add tag to xudt compatible" do
-    create(:udt, :xudt_compatible, symbol: nil)
-    assert_changes -> { XudtTag.count }, from: 0, to: 1 do
-      XudtTagWorker.new.perform
-    end
-    assert_equal ["unnamed"], XudtTag.last.tags
-  end
-
   test "when xudt with no symbol" do
     create(:udt, :xudt, symbol: nil)
     assert_changes -> { XudtTag.count }, from: 0, to: 1 do
       XudtTagWorker.new.perform
     end
-    assert_equal ["unnamed", "rgb++"], XudtTag.last.tags
+    assert_equal ["rgb++", "layer-2-asset", "supply-unlimited"], XudtTag.last.tags
   end
 
   test "insert to xudt_tags successfully" do