enable cross-signing modal is blank

[hiinaspace]

Using app.commet.chat from firefox, on an account on a synapse homeserver (not matrix.org), in the security settings, both cross-signing and message backup are apparently disabled by default:

Clicking either enable button opens up a modal which is blank grey.

In the browser console I see:

(main) [Commet (main)] �[32mFloating tile is being diposed!�[0m [js_primitives.dart:28:5](org-dartlang-sdk:///dart-sdk/lib/_internal/js_runtime/lib/js_primitives.dart)
(main) Null check operator used on a null value [js_primitives.dart:28:5](org-dartlang-sdk:///dart-sdk/lib/_internal/js_runtime/lib/js_primitives.dart)
(main) [js_primitives.dart:28:5](org-dartlang-sdk:///dart-sdk/lib/_internal/js_runtime/lib/js_primitives.dart)
(main) [Commet (main)] �[32mFinished syncing all rooms�[0m [js_primitives.dart:28:5](org-dartlang-sdk:///dart-sdk/lib/_internal/js_runtime/lib/js_primitives.dart)
(main) Another exception was thrown: Instance of 'minified:nT<void>'

Device Information

Device
Platform: web
Version: v0.4.0
Git Hash: c8ea1249d0ec05582fc007b247c5b83fe9ce72f6
Detail: default
Build Timestamp: 1770026000610 (February 2, 2026)

System Info

Product: Gecko

FWIW I also tried to start an emoji verification session from element-web (which otherwise works on this same account), but I never saw any verification popup in commet.