Bot crashed with the following error, how to prevent?

1062 |         break;
1063 |       }
1064 |     }
1065 |   }
1066 |   onError(error) {
1067 |     if ("code" in error && KnownNetworkErrorCodes.has(error.code)) {
                         ^
TypeError: error is not an Object. (evaluating '"code" in error')
      at onError (...\node_modules\@discordjs\ws\dist\index.js:1067:19)
      at <anonymous> (...\node_modules\@discordjs\ws\dist\index.js:685:12)