TypeError when Slack slash command received by bot

[sprak3000]

• botkit version v0.6.16
• Ubuntu 16.04.5 LTS
• Bot connected to Slack

Had not updated my version of botkit for some time and recently upgraded to v0.6.16. Had a working slash command prior to the upgrade. After the upgrade, sending the slash command results in this error output in the server log:

TypeError: Cannot read property 'user_id' of undefined
    at /home/ubuntu/shodan/node_modules/botkit/lib/SlackBot.js:258:34
    at /home/ubuntu/shodan/node_modules/botkit/lib/SlackBot.js:149:17
    at Store._get (/home/ubuntu/shodan/node_modules/botkit/node_modules/jfs/Store.js:198:39)
    at Store.get (/home/ubuntu/shodan/node_modules/botkit/node_modules/jfs/Store.js:351:12)
    at Object.get (/home/ubuntu/shodan/node_modules/botkit/lib/storage/simple_storage.js:54:26)
    at Object.Slackbot.slack_botkit.findTeamById (/home/ubuntu/shodan/node_modules/botkit/lib/SlackBot.js:543:36)
    at Object.Slackbot.slack_botkit.findAppropriateTeam (/home/ubuntu/shodan/node_modules/botkit/lib/SlackBot.js:147:22)
    at Object.Slackbot.slack_botkit.handleWebhookPayload (/home/ubuntu/shodan/node_modules/botkit/lib/SlackBot.js:226:22)
    at /home/ubuntu/shodan/node_modules/botkit/lib/SlackBot.js:136:26
    at Layer.handle [as handle_request] (/home/ubuntu/shodan/node_modules/express/lib/router/layer.js:95:5)
    at next (/home/ubuntu/shodan/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/home/ubuntu/shodan/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/home/ubuntu/shodan/node_modules/express/lib/router/layer.js:95:5)
    at /home/ubuntu/shodan/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/home/ubuntu/shodan/node_modules/express/lib/router/index.js:335:12)
    at next (/home/ubuntu/shodan/node_modules/express/lib/router/index.js:275:10)
    at serveStatic (/home/ubuntu/shodan/node_modules/express/node_modules/serve-static/index.js:75:16)
    at Layer.handle [as handle_request] (/home/ubuntu/shodan/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/home/ubuntu/shodan/node_modules/express/lib/router/index.js:317:13)
    at /home/ubuntu/shodan/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/home/ubuntu/shodan/node_modules/express/lib/router/index.js:335:12)
    at next (/home/ubuntu/shodan/node_modules/express/lib/router/index.js:275:10)

Added some logging to see if something within the slash command handling code was causing this, but it does not seem to even enter into the handler.

Controller setup:

    controller = Botkit.slackbot({
        debug: config.get('botkit.debug'),
        logLevel: config.get('botkit.logLevel'),
        json_file_store: config.get('botkit.jsonFileStore')
    })

...

controller.spawn({
            token: slackApiToken
        }).startRTM(function(pError, pBot, pPayload) {
            pBot.botkit.saveTeam(pPayload.team);
            channels = pPayload.channels;
            users = pPayload.users;
        });

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.