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Notice: Undefined offset: 1 in counter_get_browser() (line 72 of modules/counter/counter.lib.inc).

counter_get_browser() (Line: 91)
Drupal\counter\Plugin\Block\CounterBlock->build() (Line: 203)
Drupal\block\BlockViewBuilder::preRender(Array)
call_user_func('Drupal\block\BlockViewBuilder::preRender', Array) (Line: 376)
Drupal\Core\Render\Renderer->doRender(Array) (Line: 448)
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: 670)
__TwigTemplate_1a06e2cec1c1725c95911e8f24fb7ebebf89b7e5d7bfb1b11ada1f7d685a554f->block_sidebar_second(Array, Array) (Line: 186)
Twig_Template->displayBlock('sidebar_second', Array, Array) (Line: 503)
__TwigTemplate_1a06e2cec1c1725c95911e8f24fb7ebebf89b7e5d7bfb1b11ada1f7d685a554f->block_main(Array, Array) (Line: 186)
Twig_Template->displayBlock('main', Array, Array) (Line: 110)
__TwigTemplate_1a06e2cec1c1725c95911e8f24fb7ebebf89b7e5d7bfb1b11ada1f7d685a554f->doDisplay(Array, Array) (Line: 379)
Twig_Template->displayWithErrorHandling(Array, Array) (Line: 347)
Twig_Template->display(Array) (Line: 358)
Twig_Template->render(Array) (Line: 64)
twig_render_template('themes/bootstrap/templates/system/page.html.twig', Array) (Line: 384)
Drupal\Core\Theme\ThemeManager->render('page', Array) (Line: 435)
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: 93)
__TwigTemplate_98a8a2480461168bc9f73dd92e384332179b41d2cfa5692895bd5b5c86f7ac88->doDisplay(Array, Array) (Line: 379)
Twig_Template->displayWithErrorHandling(Array, Array) (Line: 347)
Twig_Template->display(Array) (Line: 358)
Twig_Template->render(Array) (Line: 64)
twig_render_template('themes/bootstrap/templates/system/html.html.twig', Array) (Line: 384)
Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 435)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array) (Line: 147)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 574)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 148)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 149)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 64)
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: 207)
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: 50)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 656)
Drupal\Core\DrupalKernel->handle(Object) (Line: 23)