After upgrading to Paris, catalog submissions from the service portal are stuck when submitting. A console error stating that an element cannot be returned from an undefined object.
Upon researching the console error, it was identified that the document object was undefined inside a function within a custom UI Script that was configured to the service portal theme in a JS Include.
The function lost scope to the document object; however, it is still defined outside the function. Therefore defining a variable and setting it to document allows you to use the new variable within the function. For example:
var _doc = document; // line 1 of the script
In this case, '_doc' can now be used within the defined function.