TypeError on ListElementNeighbors error handling

Sentry Issue: ARKINDEX-FRONTEND-94

TypeError: n is null
  at call (./js/store/elements.js:23:5)
  at call (./js/store/elements.js:119:7)
  at m (None:60:3)
  at o (None:60:3)
...
(9 additional frame(s) were not displayed)