Fatal error (exception) when trying to view the detailed page of a question

[oseg]

Context: elgg v3.2.0 + questions v6.0.4

Scenario:

• Click on "questions" main menu item
• Click on "add a question" button
• Fill in the question form
  • Title: "My question"
  • "Details"
  • "Tag"
  • Comment "ON"
  • who can see this "logged in users"
  • where should this question be liste "My account"
  • validate by clicking on "Submit" button
    =>"My question" is displayed among my other questions
• Click on my question to view the detailed page

Results: Fatal error (Exception)

Expected results: the detailed page of "My question"