The error can be easily reproduced in this class: https://github.com/karreiro/kie-wb-common/blob/d36c44d2ad6969ca4490dbad73d1e07942f46ee4/kie-wb-common-dmn/kie-wb-common-dmn-client/src/main/java/org/kie/workbench/common/dmn/client/editors/types/treegrid/DataTypeSelectView.java#L148-L156