Hey @liebesahe, does the app crash every time you try to launch it? If so, there seems to be an issue with the document that was open the last time, and Zotero tries to automatically open when you launch it. You can tap and hold the Zotero app icon, and select your library, so that the app launches without trying to resume your previously open document. Then, please mail the offending document to support@zotero.org, and mention this thread. If your case is different, please do provide more info.