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array_key_exists expects parameter 2 to be array null given in CI3 Auth Class

#1
Hi,

I've just updated a site to CI3 and am receiving the above error related to the following code snippet:
PHP Code:
// Get user from database
        
$user $CI->users->get(array("screen_name" => $attempt["screen_name"]));

        if (!
array_key_exists("password"$user)) {
            return 
null;
        } 

This originally returned false but changed to null after reading the CI3 Upgrade Documentation. What would be the most optimal way to solve this error?
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#2
If ( is_null( $user ) OR ! array_key_exists("password", $user ) )
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