Undefined index for selectable Admin options

  • Undefined index: cache_updation_sch

    Trace example for “none” :

    # Time Memory Function Location
    1 0.0028 478464 {main}( ) …/options-general.php:0
    2 0.0039 525984 require_once( ‘wp-admin/admin.php’ ) …/options-general.php:10
    3 2.3578 80976064 do_action( ) …/admin.php:224
    4 2.3578 80976440 WP_Hook->do_action( ) …/plugin.php:453
    5 2.3578 80976440 WP_Hook->apply_filters( ) …/class-wp-hook.php:310
    6 2.3578 80977568 wpppdf->ptp_option_page_handler( ) …/class-wp-hook.php:286
    7 2.3585 80993168 require( ‘wp-advanced-pdf/pdf_options.php’ ) …/wp-advanced-pdf.php:443
    8 2.3585 80993168 ptpdf_show_tab( ) …/pdf_options.php:67
    9 2.3614 81188608 include_once( ‘wp-advanced-pdf/libs/wpppdf-tab-general.php’ ) …/pdf_options.php:78

    It return this error for all selectable options, example : Schedule Cache Updation, Default File Name etc …

    Wordpress 5.0.3 – php 7.2

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