Please, test with all the supported browsers (Firefox, Chrome, Edge, Safari). This test requires the following: Portfolios and the file download portfolio plugin to be enabled for the site A database activity (with Approval required set to No) containing entries Set the database template to the default one but check the ##export## tag is inside the template (add it if not) This test should be done in Firefox (Chrome does not stop the JS loading so the error does not appear) Test steps: Log in as teacher/admin and access the database activity Click on the 'Export to portfolio' button of one entry Select file download as the portfolio. Open the browser console  Click on the 'Continue' button in the confirm form and wait until the download is done Check NO js errors/warning appears in the console log Check drawers (the course index for example) are toggleable (can be opened and closed)