Doesnt work with any other commands

[vetash]

When i change command on "echo" or any script - in console i see this:
[Tue Jul 07 2015 06:37:52 GMT+0800 (IRKT)] ERROR TypeError: Cannot read property 'length' of null
at SlackBot.send (/opt/slack/node_modules/hubot-slack/src/slack.coffee:201:7, :243:16)
at Response.send (/opt/slack/node_modules/hubot/src/response.coffee:22:5, :20:47)
at /opt/slack/scripts/shell.coffee:28:7, :11:13
at ChildProcess.exithandler (child_process.js:742:7)
at ChildProcess.emit (events.js:110:17)
at maybeClose (child_process.js:1015:16)
at Socket. (child_process.js:1183:11)
at Socket.emit (events.js:107:17)
at Pipe.close (net.js:485:12)

I using slack adapter.
os: debian 7