Explore (v6.7.2) crashes when toggling the query editor mode

Explore in v6.7.2 crashes when I try to toggle the graphite query editor.

This is the error I am getting: An unexpected error happened

TypeError: Cannot read property ‘finally’ of undefined
in t in div in div in t in p in div in t in div in div in t in p in t in t in div in div in div in e in t in div in t in p in n in Unknown in t in Unknown in h in Unknown in Unknown in t in t in h

To reproduce:

  1. Open https://play.grafana.org/explore
  2. Click the pencil (toggle edit mode)

Thanks for the bug report! Issue is here: https://github.com/grafana/grafana/issues/23297

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