Entries can not be created

[enriquezrene]

Please fix this error

core.js:5871 ERROR TypeError: Cannot read property 'start_date' of undefined
    at TimeEntriesComponent.saveEntry (time-entries.component.ts:46)
    at TimeEntriesComponent_Template_app_details_fields_saveEntry_31_listener (time-entries.component.html:74)
    at executeListenerWithErrorHandling (core.js:21697)
    at wrapListenerIn_markDirtyAndPreventDefault (core.js:21739)
    at SafeSubscriber.schedulerFn [as _next] (core.js:36917)
    at SafeSubscriber.__tryOrUnsub (Subscriber.js:183)
    at SafeSubscriber.next (Subscriber.js:122)
    at Subscriber._next (Subscriber.js:72)
    at Subscriber.next (Subscriber.js:49)
    at EventEmitter.next (Subject.js:39)