Notice: bp_setup_current_user was called incorrectly. The current user is being initialized without using $wp->init()

[yawalkarm]

The error can be reproduced with WordPress default themes also. Just try is_user_logged_in() check in functions.php and you will get this notice.

The issue is still not fixed. Any help is appreciated.

[slaFFik]

There are ​a bunch of other tickets here with this same error.

[r-a-y]

Thanks for the report, however you answered your own question:

Just try is_user_logged_in() check in functions.php and you will get this notice.

Using is_user_logged_in() in your theme's functions.php is too early. You should be running any type of user checks such as is_user_logged_in() on the 'set_current_user' hook or later.

Check out the action firing sequence in WordPress for more details:
​https://codex.wordpress.org/Plugin_API/Action_Reference#Actions_Run_During_a_Typical_Request

Here's an example you can use in your theme's functions.php without running into the bp_setup_current_user notice:

/**
 * Do your login check on the 'init' hook.
 */
function my_user_check() {
    // Do your login check here.
    if ( is_user_logged_in() ) {
    }
}
add_action( 'init', 'my_user_check' );