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I ran into this issue and resolved it by making sure the id value was not removed from the sidebar makrup:

For example, this one does not work

$args = array(
‘name’ => __(‘Right Sidebar’, ‘theme_text_domain’),
‘id’ => ‘right-sidebar’,
‘description’ => ”,
‘class’ => ”,
‘before_widget’ => null,
‘after_widget’ => null,
‘before_title’ => ‘<h2 class=”widgettitle title-green widget %2$s”>’,
‘after_title’ => ‘</h2>’);

while this one does

$args = array(
‘name’ => __( ‘Right Sidebar’, ‘theme_text_domain’ ),
‘id’ => ‘right-sidebar’,
‘description’ => ”,
‘class’ => ”,
‘before_widget’ => ‘<div id=”%1$s” class=”widget %2$s”>’,
‘after_widget’ => ‘</div>’,
‘before_title’ => ‘<h2 class=”widgettitle title-green”>’,
‘after_title’ => ‘</h2>’ );

Make sure “id=”%1$s” is present inside the markup under before_widget