Warning:  Undefined array key "TOUR_DETAILS" in /home/vaqqyin/public_html/App/Views/Tours/Details.php on line 591

Fatal error:  Uncaught TypeError: array_unique(): Argument #1 ($array) must be of type array, null given in /home/vaqqyin/public_html/App/Views/Tours/Details.php:591
Stack trace:
#0 /home/vaqqyin/public_html/App/Views/Tours/Details.php(591): array_unique(NULL, 0)
#1 /home/vaqqyin/public_html/App/Views/Main.php(3): include('/home/vaqqyin/p...')
#2 /home/vaqqyin/public_html/index.php(272): include('/home/vaqqyin/p...')
#3 /home/vaqqyin/public_html/App/Controllers/ToursController.php(217): views(Array, 'Tours/Details')
#4 [internal function]: {closure}('tour', Array)
#5 /home/vaqqyin/public_html/App/Lib/router.php(298): call_user_func_array(Object(Closure), Array)
#6 /home/vaqqyin/public_html/App/Lib/router.php(248): AppRouter\Router->call(Object(Closure), Array)
#7 /home/vaqqyin/public_html/App/Lib/router.php(316): AppRouter\Router->dispatch('GET', '/tour/26/06-11-...')
#8 /home/vaqqyin/public_html/index.php(438): AppRouter\Router->dispatchGlobal()
#9 {main}
  thrown in /home/vaqqyin/public_html/App/Views/Tours/Details.php on line 591