array_key_exists ERROR updating to GS 3.2.1

[D.O.]

No.
In my gsconfig it is disabled

Code:

# Turn on debug mode
#define('GSDEBUG', TRUE);

and if I turn it on, it gives me the same error message:

Code:

Warning: array_key_exists() [(function.array-key-exists)]:
The second argument should be either an array or an object in
D:\Inetpub\webs\my_site\admin\inc\caching_functions.php on line 52