TypeError: can't access property "contentWindow", document.querySelector(...) is null

[ops-handler]

Error

can't access property "contentWindow", document.querySelector(...) is null

Stack trace

/tracks/go/exercises/hello-world/edit:7 in closeModal
/tracks/go/exercises/hello-world/edit:2
/tracks/go/exercises/hello-world/edit:3

Tracking Details

• Project: exercism-js
• Sentry: TypeError: can't access property "contentWindow", document.querySelector(...) is null
• Culprit: closeModal(tracks/go/exercises/hello-world/edit)
• First seen: Aug 9, 2026