In case if your kUSD Ledger application self closes / crashes. Please re-install the Ethereum application to the latest version (at least 1.1.4) and then re-install the kUSD Ledger application. 


Proceed the steps below:
1. Reset the Ledger device
2. Re-add the ethereum app
3. Re-add the kusd ledger app.


 If after following this steps, the kUSD Ledger application will continue to crash, please report this issue to support@kowala.tech so we can further assist you with this issue.