getting this error when i ran 'COVERAGE=true ember test' have some screen shots stating the same

1.console error

2: VScode terminal error

3: debugged view

the issue is because of stringification of the data object as in (debugged view screenshot)
can u please look into it

ember-cli: 3.22.0
node: 10.16.3
ember-cli-code-coverage : 1.0.2
os: darwin x64

will be happy to help if needed