The solution is very similar to this article in our knowledge base: Student lost lots of project code because of wifi bug or server down. What next? However in this case since the student already returned to the project's code editor page and found that they lost the code, it makes sense to approach this issue with a page refresh. Pressing the refresh button in the browser will actually solve this issue most of the time. If it doesn't refer the the steps to help the student in the article mentioned above.