It seems there's no guarantee that the 'field_name' property of an $entity will be set at this point, and when a taxonomy field is empty on node preview that's what's happening.

Compare https://www.drupal.org/project/drupal/issues/1953804 and a similar issue in the linkchecker module here: https://www.drupal.org/project/linkchecker/issues/1923328

Joël Pittet authored Mar 15, 2019 and Joël Pittet committed Mar 15, 2019

Issue #1954456 by rsvelko, joelpittet, Denes.Szabo: Ensure no more false positives for fields called "weight"

Joël Pittet authored Mar 15, 2019 and Joël Pittet committed Mar 15, 2019

Issue #1954456 by rsvelko, joelpittet, Denes.Szabo: inline entity form 's save button is hidden by editablefields' .js file

Petr Parimucha authored Nov 25, 2016 and Joël Pittet committed Nov 25, 2016

Issue #1909768 by parisek, jgullstr: Editable field is hidden in Views table themed by Bootstrap theme

Issue #1189196 by mwsam, bonn: Fix Doesn't create revision on content-type when revision option is checked

Revert "Issue #1784160 by _vid | joseph.muennich: Fixed Browser-side caching of ajax callback values in Firefox causes inaccurate display of values."

This reverts commit 7079fdad.

git authored Sep 17, 2012 and David Dagino committed Sep 17, 2012

Issue #1784160 by _vid | joseph.muennich: Fixed Browser-side caching of ajax callback values in Firefox causes inaccurate display of values.

Issue #1206656 by mwsam, csdco, johnv | ShadowMonster: Fixed Error on Node view page: Argument 1 passed to drupal_array_get_nested_value().

Implement the click to edit mode, fallback formatter, Views form mode. Also fixes #1199196, #1139100, #1177372.

Feature #1197860 by jerdavis, Damien Tournoud: add a javascript behavior to automatically submit the edit form.

No Javascript is necessary, the whole AJAX interaction is handled by core Javascript.

Depends on the Entity module because we need a consistent save() for Entities.