It worked for me what made bacce.
In the file:
adminimize/inc-setup/admin-bar-items.php
On line 118: Replace this:
$disabled_admin_bar_option_ = (array) array_reduce( $disabled_admin_bar_option_, 'array_merge', array() );
So:
$disabled_admin_bar_option_ = array(); // new declaration of type
$disabled_admin_bar_option_ = array_reduce( $disabled_admin_bar_option_, 'array_merge', array() );