diff --git a/lib/bright_serializer/serializer.rb b/lib/bright_serializer/serializer.rb
index 6801839..168a71c 100644
--- a/lib/bright_serializer/serializer.rb
+++ b/lib/bright_serializer/serializer.rb
@@ -22,7 +22,7 @@ def self.included(base)
 
     def initialize(object, **options)
       @object = object
-      @params = options.delete(:params)
+      @params = options.delete(:params) || {}
       @fields = options.delete(:fields)
     end
 
diff --git a/spec/bright_serializer/serializer_params_spec.rb b/spec/bright_serializer/serializer_params_spec.rb
index f17b971..a3f13a3 100644
--- a/spec/bright_serializer/serializer_params_spec.rb
+++ b/spec/bright_serializer/serializer_params_spec.rb
@@ -15,7 +15,7 @@
           "#{object.first_name} #{object.last_name}"
         end
         attribute :params do |object, params|
-          "#{object.first_name} #{object.last_name} #{params}"
+          "#{object.first_name} #{object.last_name} #{params[:suffix]}".strip
         end
 
         attribute :params_upcase do |object, params|
@@ -23,12 +23,12 @@
         end
 
         def upcase(object, params)
-          "#{object.first_name} #{object.last_name} #{params}".upcase
+          "#{object.first_name} #{object.last_name} #{params[:suffix]}".upcase.strip
         end
       end
     end
 
-    let(:instance) { serializer_class.new(user, params: param) }
+    let(:instance) { serializer_class.new(user, params: { suffix: param }) }
 
     let(:param) { Faker::Lorem.word }
     let(:result) do
@@ -44,5 +44,20 @@ def upcase(object, params)
     it 'serialize params' do
       expect(instance.to_hash).to eq(result)
     end
+
+    context 'when not passing params' do
+      # The anonymous serializer assumes params is always a hash and calls params[:suffix] directly.
+      # This test ensures that when params is not passed, it is treated as an empty hash without raising an error.
+      it 'passes an empty hash' do
+        instance = serializer_class.new(user)
+        expect(instance.to_hash).to eq(
+          first_name: user.first_name,
+          last_name: user.last_name,
+          name: "#{user.first_name} #{user.last_name}",
+          params: "#{user.first_name} #{user.last_name}",
+          params_upcase: "#{user.first_name} #{user.last_name}".upcase
+        )
+      end
+    end
   end
 end