diff --git a/config/initializers/filter_parameter_logging.rb b/config/initializers/filter_parameter_logging.rb
index f2acc88e6..4f4e68288 100644
--- a/config/initializers/filter_parameter_logging.rb
+++ b/config/initializers/filter_parameter_logging.rb
@@ -1,9 +1,9 @@
 Rails.application.configure do
   config.filter_parameters += [:password, /^frame$/, /^nokogiri_frame$/, /^parsed_frame$/]
   config.filter_parameters << lambda do |key, value|
-    if key == 'raw_frame'
-      value.to_s.gsub!(/pw>.+<\//, 'pw>[FILTERED]</')
-      value.to_s.gsub!(/<eis:legalDocument([^>]+)>([^<])+<\/eis:legalDocument>/,
+    if key == 'raw_frame' && value.respond_to?(:gsub!)
+      value.gsub!(/pw>.+<\//, 'pw>[FILTERED]</')
+      value.gsub!(/<eis:legalDocument([^>]+)>([^<])+<\/eis:legalDocument>/,
                        "<eis:legalDocument>[FILTERED]</eis:legalDocument>")
     end
   end