My build passed but when I start this frontend UI after running bootrun, I get this error in the browser.
Hey please check, The problem could be that you are not handling the case where returned response for an API call might be null.
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Do I have to throw exception like I did before with tiingo?
Yes, exactly. Also you need to implement one thing in Factory that will allow the UI to use Alphavantage when the Tiingo service is down. With these 2 things you’ll be good to go 
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Closing this topic as there is no response since last 12 hours. Please feel free to create a new topic and post this question as a reference link in the description of the new topic.