koa-session has been upgraded from 6.1.0 to 6.2.0
When I upgraded my KOA-SESSION version to 6.2.0, my server had an error. My previous version was 6.1.0.When I sent the version back to 6.1.0, the error disappeared

The error message is:
TypeError [ERR_INVALID_ARG_TYPE]: The "string" argument must be one of type string, Buffer, or ArrayBuffer. Received type undefined