Error when user creates new language version in Firefox

Description

Preconditions
_Install Language Manager on CMS 11
_Enable languages: English, Svenska (Swedish)
_Browse site using Firefox

Steps to reproduce
1. Create a page in English.
2. Add the Language Manager gadget to Edit View.
3. Select the 'Create' link on Svenska language.
4. Select the 'Create a page on Svenska' option.

Expected: The svenska version is created without crashing
Actual: Error script :

Object { message: "Unable to load /EPiServer/cms/Stores/contentversion/8_129?dojo.preventCache=1511347091331 status: 0", stack: "_317@http://mvc11x.com/EPiServer/Shell/11.1.0.0/ClientResources/dojo/dojo.js:15:78142\n_4ff@http://mvc11x.com/EPiServer/Shell/11.1.0.0/ClientResources/dojo/dojo.js:15:134156\n", response: {…}, status: 0, responseText: "", xhr: XMLHttpRequest }
dojo.js:15:123173
Object { message: "Unable to load /EPiServer/cms/Stores/contentstructure/8?dojo.preventCache=1511347091339 status: 0", stack: "_317@http://mvc11x.com/EPiServer/Shell/11.1.0.0/ClientResources/dojo/dojo.js:15:78142\n_4ff@http://mvc11x.com/EPiServer/Shell/11.1.0.0/ClientResources/dojo/dojo.js:15:134156\n", response: {…}, status: 0, responseText: "", xhr: XMLHttpRequest }