When a quiz has "" in title, and a "Expect completed on:" date set which should display in calendar, the dashboard gives a

JSON.parse: expected ',' or '}' after property value in object at line 1 column 20 of the JSON data
File: …/lib/requirejs.php/1567170273/core/first.js
 
error.
 
To reproduce:

• As teacher, create a quiz with
  • "" in the title
  • Set "Expect completed on:" date and "Enable" that one.
• As student, go to your dashboard.