diff --git a/errors.lua b/errors.lua
index 84a9798..57e0702 100644
--- a/errors.lua
+++ b/errors.lua
@@ -146,7 +146,7 @@ return function (module_name)
             __index = function (t, k)
                 local keys = {}
                 for k in pairs(t) do  keys[#keys+1] = k  end
-		if #keys then  external_error(err_hdl, '', 'Attempting to index unknown key %s in an empty table.', k)  end
+                if #keys == 0 then  external_error(err_hdl, '', 'Attempting to index unknown key %s in an empty table.', k)  end
                 correct_error(err_hdl, '', 'Attempting to index unknown key %s, maybe you meant %s?', k, keys)
             end
         })