Slack App Keeps Crashing — What Causes It & How to Fix It

What Does This Error Mean?

Slack usually crashes because of a corrupted cache or an outdated app version. Clearing the cache fixes most crashes without losing any data. Reinstalling Slack is the nuclear option if nothing else works.

Affected Models

Slack on Windows
Slack on Mac
Slack on Android
Slack on iPhone

Common Causes

Corrupted Slack cache files on your device
Slack app is outdated and has a known crash bug
Device is low on memory (RAM) and can't keep Slack running
Slack app installation is corrupted
A conflicting security tool or antivirus is interfering with Slack

How to Fix It

Clear Slack's cache: in the Slack app, go to Help > Troubleshooting > Clear Cache and Restart.

This does not delete your messages or files — only temporary local data. It's the single most effective fix for crashes.
Update Slack to the latest version via your app store or slack.com/downloads.

Outdated versions often have crash bugs that are already fixed in newer releases.
Close other heavy applications (browsers with many tabs, video editors, games) to free up memory.

Slack needs a reasonable amount of RAM. If your device is near its limit, Slack is one of the first apps to crash.
Uninstall Slack completely, restart your device, then reinstall Slack from scratch.

This removes any corrupted installation files. Your messages and channels are stored on Slack's servers — nothing is lost.
Test whether the crash happens in a specific workspace or all workspaces.

Sign in to a different workspace to check. If only one workspace crashes, that workspace may have a problematic integration or bot — contact the workspace admin.

When to Call a Professional

This is a software issue. All fixes can be done without a technician.

Frequently Asked Questions

Will clearing Slack's cache delete my messages?

No. Your messages, files, and channels are stored on Slack's servers — not on your device. Clearing the cache only removes temporary data used to speed up the app.

Slack crashes immediately on startup — what do I do?

Start with a full uninstall and reinstall. If it still crashes on startup, try the browser version at app.slack.com to rule out an account issue.

Could an antivirus cause Slack to crash?

Yes. Some antivirus or endpoint security tools aggressively block Slack processes. Temporarily disable real-time protection and see if Slack runs — if it does, add Slack to your antivirus's exception list.