Adding a text field via Quickedit leads to unicodedecode error

[sneridagh]

1. Create a FormFolder
2. Go to Quickedit
3. Add a Text field
4. Fill required label

2018-12-11 12:15:33 ERROR Zope.SiteErrorLog 1544526933.80.0492497608184 http://localhost:8080/Plone/pfggggg/asdf/fg_base_view_p3
Traceback (innermost last):
  Module ZPublisher.Publish, line 138, in publish
  Module ZPublisher.mapply, line 77, in mapply
  Module ZPublisher.Publish, line 48, in call_object
  Module Products.CMFFormController.FSControllerPageTemplate, line 91, in __call__
  Module Products.CMFFormController.BaseControllerPageTemplate, line 32, in _call
  Module Shared.DC.Scripts.Bindings, line 322, in __call__
  Module Shared.DC.Scripts.Bindings, line 359, in _bindAndExec
  Module Products.CMFCore.FSPageTemplate, line 237, in _exec
  Module Products.CMFCore.FSPageTemplate, line 177, in pt_render
  Module Products.PageTemplates.PageTemplate, line 87, in pt_render
  Module zope.pagetemplate.pagetemplate, line 137, in pt_render
  Module five.pt.engine, line 98, in __call__
  Module z3c.pt.pagetemplate, line 163, in render
  Module chameleon.zpt.template, line 261, in render
  Module chameleon.template, line 191, in render
  Module chameleon.template, line 171, in render
  Module abc5a4f647560882bda0f8e366694f34.py, line 977, in render
  Module ca88b9938062510f080b8b7dee4c7824.py, line 1223, in render_master
  Module ca88b9938062510f080b8b7dee4c7824.py, line 420, in render_content
  Module abc5a4f647560882bda0f8e366694f34.py, line 965, in __fill_content_core
  Module abc5a4f647560882bda0f8e366694f34.py, line 332, in render_content_core
  Module 11979808c23255cb3f494ae4915ca413.py, line 368, in render_body
  Module 3528514b001eb6e891ef92140626319b.py, line 694, in render_edit
  Module 5eb8bc2872186399483a776b58eeb443.py, line 655, in render_edit
  Module 3528514b001eb6e891ef92140626319b.py, line 667, in __fill_widget_body
  Module 3528514b001eb6e891ef92140626319b.py, line 809, in render_area_edit
TypeError: decoding Unicode is not supported