Fix: reset documents sort field if user deletes the custom field (#9127)

src-ui/src/app/services/document-list-view.service.ts

@@ -306,6 +306,14 @@ export class DocumentListViewService {
             // this happens when applying a filter: the current page might not be available anymore due to the reduced result set.
             activeListViewState.currentPage = 1
             this.reload()
+          } else if (
+            activeListViewState.sortField.indexOf('custom_field') === 0 &&
+            this.settings.allDisplayFields.find(
+              (f) => f.id === activeListViewState.sortField
+            ) === undefined
+          ) {
+            // e.g. field was deleted
+            this.sortField = 'created'
           } else {
             this.selectionData = null
             let errorMessage