diff --git a/app/controllers/concerns/fieldable.rb b/app/controllers/concerns/fieldable.rb
index fa1839ebb..9db7fd604 100644
--- a/app/controllers/concerns/fieldable.rb
+++ b/app/controllers/concerns/fieldable.rb
@@ -6,7 +6,7 @@ def fields_from_params(params)
       fields = params.to_unsafe_h.dig(:fields)
       return nil unless fields.is_a?(Hash)
 
-      fields.each { |k, v| fields[k] = v.split(",") }
+      fields.each { |k, v| fields[k] = v.to_s.split(",") }
       fields
     end
   end