Error message

Notice: Undefined index: #items in _set_upcoming_sessions_data() (line 170 of modules/custom/class/class.module). _set_upcoming_sessions_data(Object, Array) (Line: 87) class_preprocess_node(Array, 'node', Array) (Line: 287) Drupal\Core\Theme\ThemeManager->render('node', Array) (Line: 437) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195) Drupal\Core\Render\Renderer->render(Array) (Line: 490) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 64) __TwigTemplate_70d144496c358179809c5e7a6b0c6704c8efb0b0141961bf396dafbdb1383134->doDisplay(Array, Array) (Line: 432) Twig_Template->displayWithErrorHandling(Array, Array) (Line: 403) Twig_Template->display(Array) (Line: 411) Twig_Template->render(Array) (Line: 64) twig_render_template('core/themes/stable/templates/views/views-view-unformatted.html.twig', Array) (Line: 384) Drupal\Core\Theme\ThemeManager->render('views_view_unformatted', Array) (Line: 437) Drupal\Core\Render\Renderer->doRender(Array) (Line: 450) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195) Drupal\Core\Render\Renderer->render(Array) (Line: 490) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 87) __TwigTemplate_d79be6a91d6cb87bf2dd4560cf9bff68dc775873ce45b89f996e64013ae1d297->doDisplay(Array, Array) (Line: 432) Twig_Template->displayWithErrorHandling(Array, Array) (Line: 403) Twig_Template->display(Array) (Line: 411) Twig_Template->render(Array) (Line: 64) twig_render_template('core/themes/stable/templates/views/views-view.html.twig', Array) (Line: 384) Drupal\Core\Theme\ThemeManager->render('views_view', Array) (Line: 437) Drupal\Core\Render\Renderer->doRender(Array) (Line: 450) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195) Drupal\Core\Render\Renderer->render(Array, ) (Line: 226) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 582) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 227) Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 117) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) call_user_func(Array, Object, 'kernel.view', Object) (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 156) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 184) Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 121) Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 75) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23) Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 666) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Warning: Invalid argument supplied for foreach() in _set_upcoming_sessions_data() (line 170 of modules/custom/class/class.module). _set_upcoming_sessions_data(Object, Array) (Line: 87) class_preprocess_node(Array, 'node', Array) (Line: 287) Drupal\Core\Theme\ThemeManager->render('node', Array) (Line: 437) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195) Drupal\Core\Render\Renderer->render(Array) (Line: 490) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 64) __TwigTemplate_70d144496c358179809c5e7a6b0c6704c8efb0b0141961bf396dafbdb1383134->doDisplay(Array, Array) (Line: 432) Twig_Template->displayWithErrorHandling(Array, Array) (Line: 403) Twig_Template->display(Array) (Line: 411) Twig_Template->render(Array) (Line: 64) twig_render_template('core/themes/stable/templates/views/views-view-unformatted.html.twig', Array) (Line: 384) Drupal\Core\Theme\ThemeManager->render('views_view_unformatted', Array) (Line: 437) Drupal\Core\Render\Renderer->doRender(Array) (Line: 450) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195) Drupal\Core\Render\Renderer->render(Array) (Line: 490) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 87) __TwigTemplate_d79be6a91d6cb87bf2dd4560cf9bff68dc775873ce45b89f996e64013ae1d297->doDisplay(Array, Array) (Line: 432) Twig_Template->displayWithErrorHandling(Array, Array) (Line: 403) Twig_Template->display(Array) (Line: 411) Twig_Template->render(Array) (Line: 64) twig_render_template('core/themes/stable/templates/views/views-view.html.twig', Array) (Line: 384) Drupal\Core\Theme\ThemeManager->render('views_view', Array) (Line: 437) Drupal\Core\Render\Renderer->doRender(Array) (Line: 450) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195) Drupal\Core\Render\Renderer->render(Array, ) (Line: 226) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 582) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 227) Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 117) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) call_user_func(Array, Object, 'kernel.view', Object) (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 156) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 184) Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 121) Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 75) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23) Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 666) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Notice: Undefined index: #items in _set_upcoming_sessions_data() (line 191 of modules/custom/class/class.module). _set_upcoming_sessions_data(Object, Array) (Line: 87) class_preprocess_node(Array, 'node', Array) (Line: 287) Drupal\Core\Theme\ThemeManager->render('node', Array) (Line: 437) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195) Drupal\Core\Render\Renderer->render(Array) (Line: 490) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 64) __TwigTemplate_70d144496c358179809c5e7a6b0c6704c8efb0b0141961bf396dafbdb1383134->doDisplay(Array, Array) (Line: 432) Twig_Template->displayWithErrorHandling(Array, Array) (Line: 403) Twig_Template->display(Array) (Line: 411) Twig_Template->render(Array) (Line: 64) twig_render_template('core/themes/stable/templates/views/views-view-unformatted.html.twig', Array) (Line: 384) Drupal\Core\Theme\ThemeManager->render('views_view_unformatted', Array) (Line: 437) Drupal\Core\Render\Renderer->doRender(Array) (Line: 450) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195) Drupal\Core\Render\Renderer->render(Array) (Line: 490) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 87) __TwigTemplate_d79be6a91d6cb87bf2dd4560cf9bff68dc775873ce45b89f996e64013ae1d297->doDisplay(Array, Array) (Line: 432) Twig_Template->displayWithErrorHandling(Array, Array) (Line: 403) Twig_Template->display(Array) (Line: 411) Twig_Template->render(Array) (Line: 64) twig_render_template('core/themes/stable/templates/views/views-view.html.twig', Array) (Line: 384) Drupal\Core\Theme\ThemeManager->render('views_view', Array) (Line: 437) Drupal\Core\Render\Renderer->doRender(Array) (Line: 450) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195) Drupal\Core\Render\Renderer->render(Array, ) (Line: 226) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 582) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 227) Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 117) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) call_user_func(Array, Object, 'kernel.view', Object) (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 156) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 184) Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 121) Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 75) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23) Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 666) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

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