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Crash when switching display mode from dark to light on >= 1.5.1 #578
Description
Hello,
I'm providing very few details to avoid information disclosure, but feel free to ask if you can't replicate or if you need more information.
I'm having this issue on 1.5.3 and 1.5.5 as well. If I recall correctly, it started with 1.5.1. I'm using gitx for a very long time and I do not recall this problem from earlier versions
How to replicate
- Open gitx
- Switch display mode to light mode/dark mode
Expected
Working
Actual
Crash
Initial Log
-------------------------------------
Translated Report (Full Report Below)
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Process: GitX [26109]
Path: /Applications/GitX.app/Contents/MacOS/GitX
Identifier: net.phere.GitX
Version: 1.5.5-HEAD (1.5.5.3170 [arm])
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: net.phere.GitX [29987]
User ID: 501
Date/Time: 2026-08-20 12:07:22.8956 +0200
Launch Time: 2026-08-20 12:07:19.6672 +0200
Hardware Model: Mac17,9
OS Version: macOS 26.6.1 (25G76)
Release Type: User
Crash Reporter Key: ---
Incident Identifier: ---
Sleep/Wake UUID: ---
Time Awake Since Boot: 220000 seconds
Time Since Wake: 6935 seconds
System Integrity Protection: enabled
Triggered by Thread: 0, Dispatch Queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Activity
tagliala commentedon Aug 20, 2026
AI-assisted investigation summary
The strongest candidate is 30230886, titled "Fix NSInvalidArgumentException: implement registerObserverForAppearanceChanges in Objective-C".
Why it stands out:
effectiveAppearanceonNSApplication.observeValueForKeyPath:ofObject:change:context:implementation in the same appearance helper path.A related precursor is 39e19941, titled "Set up Swift/ObjC interop".
An older comparison point is ba2b2caf, titled "Consolidate the Dark mode low-level helpers".
From the crash log and source review, 30230886 is the first commit I would inspect closely as the likely source of the regression.
hannesa2 commentedon Aug 20, 2026
When you know what's the issue, then please make a pull request. I'll merge it
tagliala commentedon Aug 20, 2026
Hello,
Unfortunately I'm not an objective-c / swift developer. I don't know what the issue is, it is an AI assisted investigation I've performed on the crash log
I do not have the tools at the moment to compile and test GitX, I've tried sometimes in the past without success.
I can ask an AI agent to try to fix it, but if you may know the cause or replicate, maybe it will be much an easier fix for someone skilled
tagliala commentedon Sep 14, 2026
Hi @goneng,
As a non-Objective-C / Swift developer, I asked my agents to work on this issue. They started making changes to the CSS, which surprised me.
The fix didn't work. However, since #642 is actually changing CSS, it is possible that the issue is CSS-related, maybe I (as the AI) can continue exploring that path.
goneng commentedon Sep 14, 2026
sure, give it a try - thanks!
(ping me when you have something)
Fix crash on appearance change