Uncaught TypeError: Cannot read property ‘length’ of undefined
at processRecords (virtual-util.js:24)
at VirtualScroll.writeUpdate (virtual-scroll.js:440)
at virtual-scroll.js:322
at SafeSubscriber.schedulerFn [as _next] (core.es5.js:3860)
at SafeSubscriber.__tryOrUnsub (Subscriber.js:234)
at SafeSubscriber.next (Subscriber.js:183)
at Subscriber._next (Subscriber.js:125)
at Subscriber.next (Subscriber.js:89)
at EventEmitter.Subject.next (Subject.js:55)
at EventEmitter.emit (core.es5.js:3834)
at Array. (page-transition.js:34)
at MDTransition.Animation._fireBeforeWriteFunc (animation.js:838)
at MDTransition.Animation._beforeAnimation (animation.js:749)
at MDTransition.Animation._playDomInspect (animation.js:411)
TypeError: Cannot read property 'length' of undefined
at processRecords (http://localhost:8100/build/main.js:117934:52)
at VirtualScroll.writeUpdate (http://localhost:8100/build/main.js:81238:101)
at http://localhost:8100/build/main.js:81120:19
at SafeSubscriber.schedulerFn [as _next] (http://localhost:8100/build/main.js:4139:36)
at SafeSubscriber.__tryOrUnsub (http://localhost:8100/build/main.js:15413:16)
at SafeSubscriber.next (http://localhost:8100/build/main.js:15362:22)
at Subscriber._next (http://localhost:8100/build/main.js:15304:26)
at Subscriber.next (http://localhost:8100/build/main.js:15268:18)
at EventEmitter.Subject.next (http://localhost:8100/build/main.js:24047:25)
at EventEmitter.emit (http://localhost:8100/build/main.js:4113:76)
at Array.<anonymous> (http://localhost:8100/build/main.js:41216:47)
at MDTransition.Animation._fireBeforeWriteFunc (http://localhost:8100/build/main.js:31458:34)
at MDTransition.Animation._beforeAnimation (http://localhost:8100/build/main.js:31369:14)
at MDTransition.Animation._playDomInspect (http://localhost:8100/build/main.js:31031:14)