[iOS] The app crash on the QR code Keystone scanning

[liliya-soroka]

Bug description
[iOS] The app crash on the QR code Keystone scanning
Steps To Reproduce

1. try to connect Keystone and enable Push notification / sign/execute tx with the Keystone
   Current result: The app crashes on the scanning the second code from the keystone - https://console.firebase.google.com/u/0/project/safe-firebase-mainnet/crashlytics/app/ios:io.gnosis.multisig.prod.mainnet/issues/bff17878998e8811ba31e8d98b38cea4?time=last-seven-days&types=crash&versions=3.25.5%20(2002)&sessionEventKey=2f164f261f834b269eb678b189c36121_1942046290344744431

Expected Result
It should be possible to use Keystone without app crashing
Screenshots

Device & App version

• Device/OS: iPhone11
• App version: 3.25.5(2002)

Environment
prod
Additional info
(Optional)

[liliya-soroka]

@DmitryBespalov , the app is crashing for me still.

Steps:

1. try to sign the tx using Keystone
   Current result: the app crashes during signing process with Keystone