MPMichael Prabhu M Syncfusion Team December 12, 2018 07:31 AM UTC
Greetings from Syncfusion,
We were able to reproduce the issue “Exception raised when dynamically updating the marker collection” and we confirm this as a bug and logged a defect report. You can keep track of the bug from the feedback portal below.
The fix will be available in our upcoming Volume 4 SP 1 release which is scheduled to be rolled out at end of January 2019. Would waiting for the official release work for you? Otherwise, we can provide a patch if you can create a direct track support incident.
If you have any more specification/precise replication procedure or a scenario to be tested, you can add it as a comment in the portal link above.