diff --git a/logging.lua b/logging.lua
index f06d5aa..d3af8e7 100644
--- a/logging.lua
+++ b/logging.lua
@@ -151,7 +151,7 @@ function Logger:_doPrint(level, message, ...)
   if LogLevel.isGreaterOrEqual(level, self.level) then
     local result = { tostring(LogLevel[level]), message }
     for _,v in ipairs({...}) do
-      _simpleStringify(cloneNonRecursive(v), result)
+      _simpleStringify(cloneNonRecursive(v, {}), result)
     end
     self.output(table.concat(result, " "))
   end