TypeError thrown

array_key_exists(): Argument #2 ($array) must be of type array, Ai1ec_Event given

WP RSS Aggregator Error

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Error Message:
array_key_exists(): Argument #2 ($array) must be of type array, Ai1ec_Event given (wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php:607)
Stack trace:
#0 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Environment.php(497) : eval()'d code(41): Twig\Template->getAttribute(Object(Ai1ec_Event), 'is_multiday', Array)
#1 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(455): __TwigTemplate_17c7ba0d4e4fe676adbe5794b54695ae49292265c3b0039dbb5dbf5a263c76d0->doDisplay(Array, Array)
#2 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(422): Twig\Template->displayWithErrorHandling(Array, Array)
#3 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(434): Twig\Template->display(Array)
#4 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/TemplateWrapper.php(47): Twig\Template->render(Array, Array)
#5 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Environment.php(384): Twig\TemplateWrapper->render(Array)
#6 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/all-in-one-event-calendar/lib/twig/environment.php(80): Twig\Environment->render('event-single.tw...', Array)
#7 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/all-in-one-event-calendar/lib/theme/file/twig.php(61): Ai1ec_Twig_Environment->render('event-single.tw...', Array)
#8 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/all-in-one-event-calendar/lib/theme/loader.php(333): Ai1ec_File_Twig->process_file()
#9 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/all-in-one-event-calendar/app/view/event/single.php(158): Ai1ec_Theme_Loader->get_file('event-single.tw...', Array, false)
#10 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/all-in-one-event-calendar/lib/command/render-event.php(70): Ai1ec_View_Event_Single->get_content(Object(Ai1ec_Event))
#11 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/all-in-one-event-calendar/lib/command/abstract.php(76): Ai1ec_Command_Render_Event->do_execute()
#12 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-content/plugins/all-in-one-event-calendar/app/controller/front.php(172): Ai1ec_Command->execute()
#13 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-includes/class-wp-hook.php(307): Ai1ec_Front_Controller->route_request('')
#14 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#15 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#16 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-includes/template-loader.php(13): do_action('template_redire...')
#17 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/wp-blog-header.php(19): require_once('/customers/3/8/...')
#18 /customers/3/8/0/hbv-nochtenwille.nl/httpd.www/index.php(17): require('/customers/3/8/...')
#19 {main}