Samsung's native Messages app keeps crashing recently? You're not alone. Samsung smartphone users posted complaints of their Messages app crashing. The Messages app comes pre-installed on Samsung phones; note this is a separate app from Google's Messages app (the Google logo appears on the Google Messages app).

The error was due to an update to Google Meet. As a temporary remedy, try setting Google Messages as your default message app, or disabling / uninstalling the Google Meet app.
Go to Settings > Apps > Meet > Force Stop, then click uninstall updates.

Google has issued a patch on fixing the random crashes. With the Google Meet patch issued, be sure to update your Meet app. Otherwise, keep it disabled or use Google Messages.