Error message

• Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in mei_library_tpl_value() (line 226 of modules/custom/mei_library/mei_library.module).

  mei_library_tpl_value(Object, 'marc_volume') (Line: 58)
  Drupal\mei_library\Plugin\Block\BookInfo->build() (Line: 171)
  Drupal\block\BlockViewBuilder::preRender(Array)
  call_user_func_array(Array, Array) (Line: 101)
  Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. See https://www.drupal.org/node/2966725', 'exception', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 788)
  Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 374)
  Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 204)
  Drupal\Core\Render\Renderer->render(Array, 1) (Line: 160)
  Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 580)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 161)
  Drupal\Core\Render\Renderer->renderPlain(Array) (Line: 175)
  Drupal\Core\Render\Renderer->renderPlaceholder('', Array) (Line: 665)
  Drupal\Core\Render\Renderer->replacePlaceholders(Array) (Line: 550)
  Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 204)
  Drupal\Core\Render\Renderer->render(Array, 1) (Line: 148)
  Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 580)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 149)
  Drupal\Core\Render\Renderer->renderRoot(Array) (Line: 278)
  Drupal\Core\Render\HtmlResponseAttachmentsProcessor->renderPlaceholders(Object) (Line: 71)
  Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments(Object) (Line: 45)
  Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond(Object, 'kernel.response', Object)
  call_user_func(Array, Object, 'kernel.response', Object) (Line: 142)
  Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.response') (Line: 202)
  Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object, Object, 1) (Line: 190)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
  Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
  Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 191)
  Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128)
  Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82)
  Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
  Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
  Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)
  Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
  

• Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\mei_library\Plugin\Block\BookInfo->build() (line 96 of modules/custom/mei_library/src/Plugin/Block/BookInfo.php).

  Drupal\mei_library\Plugin\Block\BookInfo->build() (Line: 171)
  Drupal\block\BlockViewBuilder::preRender(Array)
  call_user_func_array(Array, Array) (Line: 101)
  Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. See https://www.drupal.org/node/2966725', 'exception', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 788)
  Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 374)
  Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 204)
  Drupal\Core\Render\Renderer->render(Array, 1) (Line: 160)
  Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 580)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 161)
  Drupal\Core\Render\Renderer->renderPlain(Array) (Line: 175)
  Drupal\Core\Render\Renderer->renderPlaceholder('', Array) (Line: 665)
  Drupal\Core\Render\Renderer->replacePlaceholders(Array) (Line: 550)
  Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 204)
  Drupal\Core\Render\Renderer->render(Array, 1) (Line: 148)
  Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 580)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 149)
  Drupal\Core\Render\Renderer->renderRoot(Array) (Line: 278)
  Drupal\Core\Render\HtmlResponseAttachmentsProcessor->renderPlaceholders(Object) (Line: 71)
  Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments(Object) (Line: 45)
  Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond(Object, 'kernel.response', Object)
  call_user_func(Array, Object, 'kernel.response', Object) (Line: 142)
  Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.response') (Line: 202)
  Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object, Object, 1) (Line: 190)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
  Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
  Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 191)
  Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128)
  Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82)
  Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
  Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
  Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)
  Drupal\Core\DrupalKernel->handle(Object) (Line: 19)