[bug] My program crashed when I called @tauri-apps/api/app setTheme.

[sopaco]

Describe the bug

My program crashed when I called setTheme.
Macbook M2 Pro, MacOS Sonoma 14.5 (23F79), tauri 2.5.1

import { setTheme } from '@tauri-apps/api/app';
function switchTheme() {
    setTheme('dark');
}

permission declared in tauri.conf.json

"permissions": {
		"core:app:default",
		"core:app:allow-set-app-theme",
}

Reproduction

No response

Expected behavior

No response

Full tauri info output

2025-05-14 18:16:52.927170+0800 qino-feed-client[53816:11363262] [ProcessSuspension] 0x116024900 - ProcessAssertion::acquireSync Failed to acquire RBS assertion 'XPCConnectionTerminationWatchdog' for process with PID=54376, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
2025-05-14 18:16:52.929994+0800 qino-feed-client[53816:11363262] [assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>
2025-05-14 18:16:52.930023+0800 qino-feed-client[53816:11363262] [ProcessSuspension] 0x116024960 - ProcessAssertion::acquireSync Failed to acquire RBS assertion 'WebProcess NearSuspended Assertion' for process with PID=54376, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
2025-05-14 18:16:59.289129+0800 qino-feed-client[53816:11360392] [miscellany] CLIENT ERROR: TUINSRemoteViewController does not override -viewServiceDidTerminateWithError: and thus cannot react to catastrophic errors beyond logging them
Exception: EXC_BREAKPOINT (code=1, subcode=0x19ae7e4f4)
Exception: EXC_BREAKPOINT (code=1, subcode=0x19ae7e4f4)
Exception: EXC_BREAKPOINT (code=1, subcode=0x19ae7e4f4)

[FabianLars]

Please include the output of the tauri info command as required by the issue template :)

[sopaco]

Please include the output of the tauri info command as required by the issue template :)
@FabianLars

[✔] Environment
- OS: Mac OS 14.5.0 arm64 (X64)
✔ Xcode Command Line Tools: installed
✔ rustc: 1.86.0 (05f9846f8 2025-03-31)
✔ cargo: 1.86.0 (adf9b6ad1 2025-02-28)
✔ rustup: 1.28.1 (f9edccde0 2025-03-05)
✔ Rust toolchain: stable-aarch64-apple-darwin (default)
- node: 22.14.0
- npm: 10.9.2
- bun: 1.2.9

[-] Packages
- tauri 🦀: 2.5.1
- tauri-build 🦀: 2.2.0
- wry 🦀: 0.51.2
- tao 🦀: 0.33.0
- tauri-cli 🦀: 2.0.0-rc.5 (outdated, latest: 2.5.0)
- @tauri-apps/api : not installed!
- @tauri-apps/cli : 2.5.0

[-] Plugins
- tauri-plugin-clipboard-manager 🦀: 2.2.2
- @tauri-apps/plugin-clipboard-manager : 2.2.2
- tauri-plugin-fs 🦀: 2.2.1
- @tauri-apps/plugin-fs : not installed!
- tauri-plugin-os 🦀: 2.2.1
- @tauri-apps/plugin-os : 2.2.1
- tauri-plugin-single-instance 🦀: 2.2.3
- @tauri-apps/plugin-single-instance : not installed!
- tauri-plugin-autostart 🦀: 2.3.0
- @tauri-apps/plugin-autostart : 2.3.0
- tauri-plugin-dialog 🦀: 2.2.1
- @tauri-apps/plugin-dialog : 2.2.1
- tauri-plugin-shell 🦀: 2.2.1
- @tauri-apps/plugin-shell : 2.2.1

[-] App
- build-type: bundle
- CSP: unset
- frontendDist: ../build
- devUrl: http://localhost:1420/

[FabianLars]

Thanks.

I also have a M2 Pro but with macos 15.4.1 and there i don't see any crashes but it doesn't seem to change the theme. 🤔

[sopaco]

I also have a M2 Pro but with macos 15.4.1 and there i don't see any crashes but it doesn't seem to change the theme. 🤔

Here is my project. When you run it, click the settings button. In the pop - up window, select Dark Mode, and then the issue can be reproduced. Can you help me take a look? Thanks. @FabianLars
You can start the project by running bun run dev or npm run dev.

https://github.com/sopaco/saga-reader/blob/dev/app/src/lib/themes/index.ts

[sopaco]

Is it means appears that the crash was caused by not executing the code on the main thread?

[Legend-Master]

Probably the case, we didn't do that for the app's setTheme, only the one on the Window was run on main thread, not sure how we didn't discover this earlier though (to be honest, I'm not entirely sure which call should be run on main thread)

[Legend-Master]

Made a PR #13443, do you mind give it a try and see if it fixes the problem? Thanks for the detailed report by the way

[sopaco]

Probably the case, we didn't do that for the app's setTheme, only the one on the Window was run on main thread, not sure how we didn't discover this earlier though (to be honest, I'm not entirely sure which call should be run on main thread)

My scene is a multi-window application. Maybe it has something to do with setting the app's theme from a window? Is it true that each window has its own main loop in macOS?

[sopaco]

Made a PR #13443, do you mind give it a try and see if it fixes the problem? Thanks for the detailed report by the way

II'll give this solution a try. But how can I make this code modification take effect in my project?

[Legend-Master]

But how can I make this code modification take effect in my project?

Just put this code in your Cargo.toml file

[patch.crates-io]
tauri = { git = "https://github.com/Legend-Master/tauri.git", branch = "run-set-theme-on-main-thread" }

[sopaco]

But how can I make this code modification take effect in my project?

Just put this code in your Cargo.toml file

[patch.crates-io]
tauri = { git = "https://github.com/Legend-Master/tauri.git", branch = "run-set-theme-on-main-thread" }

Thanks, I've verified it, and now it's working correctly. It can switch the changes of the application theme.

But there has another issue. First, after the theme changes, the appWindow.onThemeChanged in the Tauri API fails to trigger the listening callback. (The standard Web API's MediaQuery changed event works, so I'm using this method as a substitute for now.)