diff --git a/app/controllers/tags_controller.rb b/app/controllers/tags_controller.rb
index 10b105acc2c..fbf0953d991 100644
--- a/app/controllers/tags_controller.rb
+++ b/app/controllers/tags_controller.rb
@@ -585,6 +585,6 @@ class TagsController < ::ApplicationController
   end
 
   def tag_params
-    Array(params[:tags]).concat(Array(@additional_tags))
+    Array(params[:tags]).map(&:to_s).concat(Array(@additional_tags))
   end
 end
diff --git a/spec/requests/tags_controller_spec.rb b/spec/requests/tags_controller_spec.rb
index 5b247625b12..a962655dff3 100644
--- a/spec/requests/tags_controller_spec.rb
+++ b/spec/requests/tags_controller_spec.rb
@@ -518,6 +518,11 @@ RSpec.describe TagsController do
         expect(topic_ids).to_not include(topic_in_subcategory_without_tag.id)
       end
     end
+
+    it "should ignore invalid tag parameter" do
+      get "/tag/test.json?tags[0]=nada"
+      expect(response.status).to eq(200)
+    end
   end
 
   describe "#info" do