exception thrown when undefined property is checked for uniqueness

[philippsimon]

TypeError: Cannot read property 'constructor' of undefined
    at MySQL.all.order ([...]/node_modules/jugglingdb-mysql/lib/mysql.js:270:34)
    at Array.forEach (native)
    at buildWhere ([...]/node_modules/jugglingdb-mysql/lib/mysql.js:265:28)
    at MySQL.all ([...]/node_modules/jugglingdb-mysql/lib/mysql.js:233:26)
    at Function.all ([...]/node_modules/jugglingdb/lib/model.js:396:25)
    at ModelConstructor.validateUniqueness ([...]/node_modules/jugglingdb/lib/validations.js:289:22)
    at validationFailed ([...]/node_modules/jugglingdb/lib/validations.js:465:15)
    at Validatable.isValid.trigger.constructor._validations.forEach.valid ([...]/node_modules/jugglingdb/lib/validations.js:367:21)

[dgsan]

Setting aside the uniqueness constraint:

What do you even expect to have happen when you try to store undefined in MySQL? It seems kind of like undefined behavior in C. I agree ending up with an exception isn't the greatest thing, but what should it do?