This is a submission for DEV's Summer Bug Smash: Clear the Lineup powered by Sentry . You are migrating a 50,000-message Slack workspace to Zulip. Somewhere around message 31,000 the import dies with KeyError: 'ts' .
Source: [Dev.to](https://dev.to/p0rt/the-bug-that-crashes-your-import-is-the-lucky-one-25of)