Fix the exception of accessing an ArrayMap

- ArrayMap is not thread-safe.
- When accessing the map across threads at the same time, the map may
throw a ConcurrentModificationException.
- Convert the map to a synchronizedMap to avoid the exception.

Fixes: 159813482
Test: robotest
Change-Id: I3b8bdd435c7c546acf736fa8aafd2ceaed94d081