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Please confirm that your pull request follows our guidelines found in CONTRIBUTING and that you provide enough information so that we can review your pull request.
<Description of pull request, e.g. "Fix Grid Column not sortable with backend data and sort property">
Fixes #
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[ ] Valid tests for the pull request
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See: https://vaadin.com/forum/thread/17522264/concurrentmodificationexception-in-vaadin-shared-on-karaf-4-2-x
Thanks for submitting a pull request! Please confirm that your pull request follows our guidelines found in CONTRIBUTING and that you provide enough information so that we can review your pull request.
<Description of pull request, e.g. "Fix Grid Column not sortable with backend data and sort property">
Fixes #
Check when you have completed [ ] Valid tests for the pull request [ ] Contributing guidelines implemented