Brave iOS crashes if Leo/Leo settings are accessed while Leo is disabled in flags

[LegalizeNukes]

Description

In Brave iOS v1.70.133 if Leo is disabled using flags (#brave-ai-chat) upon interacting with anything related to Leo (icon, Leo settings) the browser will crash. Either interacting with Leo should do nothing or anything Leo-related should be hidden from the interface.

Steps to reproduce

1. Disable Leo via flags.
2. Interact with anything related to Leo in the browser.

Actual result

Browser crashes.

Expected result

Browser should not crash.

Reproduces how often

Easily reproduced

Brave version

1.70.133 Chromium: 129.0.6668.100 (Official Build) stable (64-bit)

Device/iOS version

iPhone 16 Pro on iOS 18.1

Affected browser versions

• latest AppStore
• latest TestFlight
• previous TestFlight

Reproducibility

• with Brave Shields disabled
• in the latest version of mobile Safari

Miscellaneous information

No response

[kjozwiak]

The above requires 1.73.90 or higher for 1.73.x verification 👍

[Uni-verse]

Verified on iPhone 12 running iOS 18.0 using version 1.73 (91)

• Ensured that disabling brave-ai-chat will remove Leo elements from UI and menus.
• Ensured that Ask Leo is not shown in search bar when enter query.
• Ensured crash does not occur when using Leo.

example	example	example	example	example

[Uni-verse]

Verified on iPad (9th Gen) running iOS 17.7.1 using version 1.73 (91)

• Ensured that disabling brave-ai-chat will remove Leo elements from UI and menus.
• Ensured that Ask Leo is not shown in search bar when enter query.
• Ensured crash does not occur when using Leo.

example	example	example	example