Fix

Add the line
if ( access_has_project_level( config_get( 'create_permalink_threshold' ) ) ) {
before the existing line
print_bracket_link(
in the file 'filter_api.php'

Add a closing bracket
}
at the end of this block, after the already existing closing bracket.
The entire codelines should look like this:

if ( access_has_project_level( config_get( 'create_permalink_threshold' ) ) ) {
print_bracket_link( 
    'permalink_page.php?url=' . urlencode( filter_get_url( $t_filter ) ), 
    lang_get( 'create_filter_link' ), 
    /* new window = */ true );
}

}