Problem with update_user_meta() meta_value

I fixed it doing like below:

$meta_value = //data from an API (e.g.: 19, 34, 1290 etc)
$meta_value_string = "". $meta_value;
$user_id = wp_insert_user( $new_user_data );
update_user_meta( $user_id, 'my_meta_key', $meta_value_string );

Now it works fine.

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