TypeError: Cannot read property 'call' of undefined

[betweenbrain]

At Nodeschool International Day today in Western Mass, a number of users are getting the following error with a passing exercise.

Your submission results compared to the expected:

                 ACTUAL                                 EXPECTED                
────────────────────────────────────────────────────────────────────────────────

   "CHANGELOG.md"                      ==    "CHANGELOG.md"                     
   "LICENCE.md"                        ==    "LICENCE.md"                       
   "README.md"                         ==    "README.md"                        
   ""                                  ==    ""                                 

────────────────────────────────────────────────────────────────────────────────

/usr/local/lib/node_modules/learnyounode/node_modules/workshopper-exercise/exercise.js:188
    processors[i].call(self, mode, function (err, pass) {
                 ^

TypeError: Cannot read property 'call' of undefined
    at next (/usr/local/lib/node_modules/learnyounode/node_modules/workshopper-exercise/exercise.js:188:18)

Node version is v5.8.0