diff --git a/app/workers/xudt_tag_worker.rb b/app/workers/xudt_tag_worker.rb
index be35c1be8..b47bf491e 100644
--- a/app/workers/xudt_tag_worker.rb
+++ b/app/workers/xudt_tag_worker.rb
@@ -2,7 +2,7 @@ class XudtTagWorker
   include Sidekiq::Job
 
   def perform
-    udts = Udt.published_xudt.left_joins(:xudt_tag).where(xudt_tag: { id: nil }).limit(100)
+    udts = Udt.published_xudt.left_joins(:xudt_tag).where(xudt_tag: { id: nil }).where.not(issuer_address: nil).limit(100)
     if !udts.empty?
       attrs =
         udts.map do |udt|
@@ -46,7 +46,7 @@ def invisible_char?(symbol)
   end
 
   def out_of_length?(symbol)
-    symbol.length > 5 || symbol.length < 4
+    symbol.length > 60
   end
 
   def first_xudt?(symbol, block_timestamp)
diff --git a/test/factories/udt.rb b/test/factories/udt.rb
index 094165fdc..210ed5861 100644
--- a/test/factories/udt.rb
+++ b/test/factories/udt.rb
@@ -9,6 +9,11 @@
     symbol { "kfc" }
     decimal { 6 }
     h24_ckb_transactions_count { 0 }
+    issuer_address do
+      script = CKB::Types::Script.new(code_hash: Settings.secp_cell_type_hash, args: "0x#{SecureRandom.hex(20)}",
+                                      hash_type: "type")
+      CKB::Address.new(script).generate
+    end
 
     trait :with_transactions do
       after(:create) do |udt, _evaluator|
@@ -71,6 +76,5 @@
       symbol { "XC" }
       decimal { 8 }
     end
-
   end
 end
diff --git a/test/workers/xudt_tag_worker_test.rb b/test/workers/xudt_tag_worker_test.rb
index d590969ba..bd6577b94 100644
--- a/test/workers/xudt_tag_worker_test.rb
+++ b/test/workers/xudt_tag_worker_test.rb
@@ -48,7 +48,7 @@ class XudtTagWorkerTest < ActiveJob::TestCase
   end
 
   test "insert out-of-length-range tag" do
-    create(:udt, :xudt, symbol: "CK BBBB")
+    create(:udt, :xudt, symbol: "CKBBBB" * 11)
     assert_changes -> { XudtTag.count }, from: 0, to: 1 do
       XudtTagWorker.new.perform
     end