Safari crashes when editing menu. IE Throws Unhandled Exception

Create new project based on archetype (please verify that these command are right):

mvn archetype:generate -DarchetypeGroupId=org.onehippo.cms7 -DarchetypeArtifactId=hippo-project-archetype -DarchetypeVersion=2.01.00-SNAPSHOT -DarchetypeRepository=http://maven.onehippo.com/maven2-snapshots

cd myhippoproject

mvn -U clean verify -Dhippo.snapshots && mvn -Pcargo.run -Drepo.path=storage -Dhippo.snapshots

log in as editor/editor, Dutch in CMS

go to Essentials, add Blog and Menu component

click rebuild

ctrl-C

mvn verify -Dhippo.snapshots

mvn -Pcargo.run -Drepo.path=storage

Second build is required by essentials I noticed after starting:

ctrl-C

mvn verify -Dhippo.snapshots

mvn -Pcargo.run -Drepo.path=storage

log in as editor/editor, Dutch in CMS

go to channel manager

edit channel, edit menu and close dialog.

See screenshot for what happens next, a second later safari crashes