In an era of always-on digital communication where office chats often rely on third-party tech, you need a backup communications plan to handle problems like Wednesday’s crash.

Slack platform outage left users unable to use the collaboration messaging app, throwing a wrench in the work day.

Open the Slack desktop app, then click Help in your computer’s top menu bar. (On Windows 10, click the three horizontal lines icon in the top left of the Slack app.) Click Clear Cache and restart. The Slack team said the cause of the outage was “a symptom of an earlier incident,” and did not specify further.