I get the following error when trying to click on an Edit button, what could be the problem? Ask me for code or line numbers if needed. Here is the error:
Uncaught TypeError: Cannot read properties of null (reading 'querySelector')
    at toggleButtons (app.js:88:38)
    at editQuestion (app.js:31:3)
    at HTMLButtonElement.<anonymous> (app.js:9:7) Write exactly 10 paragraphs each separated with two new lines answering this question. The first paragraph must start with "completely".
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