TYPO3 Core

(Actions performed as admin user)

Error message in JavaScript console:

Uncaught TypeError: Cannot convert undefined or null to object
    at Function.keys (<anonymous>)
    at InputTransformer.flattenObject (input-transformer.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13:641)
    at input-transformer.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13:770
    at Array.reduce (<anonymous>)
    at InputTransformer.flattenObject (input-transformer.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13:649)
    at InputTransformer.toSearchParams (input-transformer.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13:481)
    at AjaxRequest.withQueryArguments (ajax-request.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13:352)
    at Localization.localizeRecords (localization.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13:6623)
    at Object.callback (localization.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13:5597)
    at Wizard.runSlideCallback (wizard.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13:3552)
flattenObject @ input-transformer.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13
(anonymous) @ input-transformer.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13
flattenObject @ input-transformer.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13
toSearchParams @ input-transformer.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13
withQueryArguments @ ajax-request.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13
localizeRecords @ localization.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13
(anonymous) @ localization.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13
runSlideCallback @ wizard.js?bust=f9d9bd3aaf0d3feb0db376ef46b9f751eb2d2929:13

The reason is, that in localization.ts, the corresponding action is still null, since there are two @availableLocalizationModes (copy and translate), but the handling just expects to have one...

<a href="#" class="btn btn-default btn-sm t3js-localize" title="" 
  data-page="[Translate to Dansk:] 404" data-has-elements="0" 
  data-allow-copy="1" data-allow-translate="1" data-table="tt_content" 
  data-page-id="6" data-language-id="1" data-language-name="Dansk">
...    
  Translate
</a>