Graphql-playground: Cannot read property 'getWrappedInstance' of null

[marktani]

This issue pertains to the following package(s):

• [x] GraphQL Playground - Electron App

What OS and OS version are you experiencing the issue(s) on?

Mac OS X Sierra

What version of graphql-playground(-electron/-middleware) are you experiencing the issue(s) on?

1.3.20

What is the expected behavior?

Opening another workspace works.

What is the actual behavior?

Opening another workspaces returns Cannot read property 'getWrappedInstance' of null error

What steps may we take to reproduce the behavior?

npm install -g graphql-cli graphcool@beta
graphql create my-app 
# choose node-advanced
graphcool deploy
yarn start
yarn playground
# open "dev" workspace

[huv1k]

Its fixed in #397

[schickling]

Thanks a lot for your help @Huvik! 💪