Error message

Warning: Illegal string offset 'corporate_name' in Drupal\publisso_gold\Views\Volume->Drupal\publisso_gold\Views\{closure}() (line 263 of modules/custom/publisso_gold/src/Views/Volume.php).

Drupal\publisso_gold\Views\Volume->Drupal\publisso_gold\Views\{closure}('GMDS-Projektgruppe „MI-Lehre in der Medizin“')
array_map(Object, Array) (Line: 262)
Drupal\publisso_gold\Views\Volume->renderArticlesForVolume(Array, Object, 'en', Object) (Line: 221)
Drupal\publisso_gold\Views\Volume->renderVolumeView(Object, Object, Object) (Line: 108)
Drupal\publisso_gold\Views\Volume->setJournalContent_volume(Object, Object, NULL) (Line: 226)
Drupal\publisso_gold\Views\Journal->setJournalContent(Object, Object, NULL) (Line: 190)
Drupal\publisso_gold\Views\Article->getJournalBody(Object, 'volume') (Line: 132)
Drupal\publisso_gold\Views\Article->getArticleHTMLbyId('24', '149', '4319', 'volume') (Line: 101)
Drupal\publisso_gold\Views\Article->getArticleHTML('mibe', 'volume8', 'mibe000127', 'volume')
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 564)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 158)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 80)
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: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
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: 708)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)