Clicking link in high risk page causes runtime error

[denistsoi]

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• I'm submitting a ...

  • bug report
  • feature request
  • support request => Please do not submit support request here, see note at the top of this template.

• Do you want to request a feature or report a bug?
  Bug

• What is the current behavior?
  the app crashes on high-risk map page

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

go to https://wars.vote4.hk/en/high-risk/
click on case #275
page is blank and shows error below

Uncaught (in promise) Error: Invalid LatLng object: (NaN, 114.131)
    at new N (leaflet-src.js:1333)
    at U (leaflet-src.js:1406)
    at e.initialize (leaflet-src.js:7071)
    at new e (leaflet-src.js:349)
    at Object.t.marker (leaflet-src.js:7336)
    at i.dataPointToMarker (highRiskMap.js:240)
    at Array.map (<anonymous>)
    at n.<anonymous> (highRiskMap.js:261)
    at u (runtime.js:69)
    at Generator._invoke (runtime.js:288)

• What is the expected behavior?

• What is the motivation / use case for changing the behavior?

• Please tell us about your environment:

  • Version: 2.0.0-beta.X
  • Browser: [Chrome latest]
  • Language: [all | TypeScript X.X | ES6/7 | ES5 | Dart]

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, gitter, etc)