lib/fluent/plugin/out_string_scrub.rb in fluent-plugin-string-scrub-0.0.3 vs lib/fluent/plugin/out_string_scrub.rb in fluent-plugin-string-scrub-0.0.4

@@ -75,10 +75,14 @@
     begin
       string =~ //
       return string
     rescue ArgumentError => e
       raise e unless e.message.index("invalid byte sequence in") == 0
-      string.scrub!(@replace_char)
+      if string.frozen?
+          string = string.dup.scrub!(@replace_char)
+      else
+          string.scrub!(@replace_char)
+      end
       retry
     end
   end
 end