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User error: "1" is an invalid render array key. How do I find where the error is coming from?

I get this error on every page. How do I debug or find what is causing it?

I thought it might have been changes to a twig template, but I tried other themes, and still had the error.

I’ve disabled all custom modules.

I searched and found User error: "1" is an invalid render array key in DrupalCoreRenderElement::children() Which suggests its custom theming related but I am using core theme without any changes to the code.

User error: "1" is an invalid render array key in DrupalCoreRenderElement::children() (line 98 of corelibDrupalCoreRenderElement.php). DrupalCoreRenderElement::children(Array, 1) (Line: 393) DrupalCoreRenderRenderer->doRender(Array) (Line: 435) DrupalCoreRenderRenderer->doRender(Array) (Line: 435) DrupalCoreRenderRenderer->doRender(Array, ) (Line: 201) DrupalCoreRenderRenderer->render(Array) (Line: 479) DrupalCoreTemplateTwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 90) __TwigTemplate_5c9e4beab1e145186c53285963d726c00acecd8f392e4d019b6f41f835d1e619->doDisplay(Array, Array) (Line: 405) TwigTemplate->displayWithErrorHandling(Array, Array) (Line: 378) TwigTemplate->display(Array) (Line: 390) TwigTemplate->render(Array) (Line: 55) twig_render_template('core/themes/seven/templates/classy/layout/html.html.twig', Array) (Line: 384) DrupalCoreThemeThemeManager->render('html', Array) (Line: 422) DrupalCoreRenderRenderer->doRender(Array, ) (Line: 201) DrupalCoreRenderRenderer->render(Array) (Line: 162) DrupalCoreRenderMainContentHtmlRenderer->DrupalCoreRenderMainContent{closure}() (Line: 564) DrupalCoreRenderRenderer->executeInRenderContext(Object, Object) (Line: 163) DrupalCoreRenderMainContentHtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) DrupalCoreEventSubscriberMainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) call_user_func(Array, Object, 'kernel.view', Object) (Line: 142) DrupalComponentEventDispatcherContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 163) SymfonyComponentHttpKernelHttpKernel->handleRaw(Object, 1) (Line: 80) SymfonyComponentHttpKernelHttpKernel->handle(Object, 1, 1) (Line: 58) DrupalCoreStackMiddlewareSession->handle(Object, 1, 1) (Line: 48) DrupalCoreStackMiddlewareKernelPreHandle->handle(Object, 1, 1) (Line: 106) Drupalpage_cacheStackMiddlewarePageCache->pass(Object, 1, 1) (Line: 85) Drupalpage_cacheStackMiddlewarePageCache->handle(Object, 1, 1) (Line: 48) DrupalCoreStackMiddlewareReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51) DrupalCoreStackMiddlewareNegotiationMiddleware->handle(Object, 1, 1) (Line: 23) StackStackedHttpKernel->handle(Object, 1, 1) (Line: 708) DrupalCoreDrupalKernel->handle(Object) (Line: 19)

I’m not sure if it happened after I ran composer update, could this be a contributed module which was updated that is causing this?

How can I find out more information to debug where it is coming from?

This article was republished from its original source.
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User error: "1" is an invalid render array key. How do I find where the error is coming from?

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