Cannot read property 'prototype' of undefined

[markanderson313131]

I'm getting the following error after running NODE_ENV=production node app.js. Any ideas about what I might be doing wrong?

Users/abc/Sites/_assets/tumbsup/node_modules/connect-redis/lib/connect-redis.js:96
RedisStore.prototype.proto = Store.prototype;
^
TypeError: Cannot read property 'prototype' of undefined
at module.exports (/Users/abc/Sites/_assets/tumbsup/node_modules/connect-redis/lib/connect-redis.js:96:41)
at Object. (/Users/abc/Sites/_assets/tumbsup/app.js:14:42)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:902:3