How do I solve the errors I receive after deleting the comments field of a content type?

After removing the comment field from the user interface and uninstalling the Comments module, I can not open any Article node.

In the Drupal registry, I find this message.

InvalidArgumentException: the field comment is unknown. in Drupal Core Entity ContentEntityBase-> getTranslatedField () (line 580 of core / lib / Drupal / Core / Entity / ContentEntityBase.php).
Drupal Core Entity ContentEntityBase-> get ("comment") (Line: 17)
gavias_sanbro_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: 226)
Drupal Core Render MainContent HtmlRenderer-> Drupal Core Render MainContent {closing} () (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: 99)
Drupal page_cache StackMiddleware PageCache-> pass (Object, 1, 1) (Line: 78)
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: 657)
Drupal Core DrupalKernel-> handle (Object) (Line: 19)

How can I solve this problem?