Have you attempted a hard reset first then re-attempting to delete the app? Deleting packages through Cydia should not yield crashes because it's ran as root. The only time it would crash is if your RAM is draining rapidly and Cydia can't sequence through the APT remove command, or, if a Cydia core directory is corrupted, which would yield errors before or during the APT remove command is ran, not afterwards. If you're using Cydelete, that may be a cause as well