completer service fails after deleting the field

Hi! I'm getting this error:   CompleterComponent.html:3 ERROR TypeError: Cannot read property 'title' of null at eval (input.directive.ts:48) at SafeSubscriber.schedulerFn [as _next] (core.js:4343) at SafeSubscriber.__tryOrUnsub (Subscriber.js:240) at SafeSubscriber.next (Subscriber.js:187) at Subscriber._next (Subscriber.js:128) at Subscriber.next (Subscriber.js:92) at EventEmitter.Subject.next (Subject.js:56) at EventEmitter.emit (core.js:4311) at MdbCompleterDirective.search (completer.directive.ts:62) at eval (input.directive.ts:67)   I'm filling a completer service with data from an observer, and searching. It works, I click on the option I want. After that, if I delete the data on that field and try to look for the search again, it throws that error.  

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