Error in gatsby-docs-kit.yml causes Unhandled Exception

[kkoscielniak]

Erroneous data in gatsby-docs-kit.yml causes Unhandled Exception and, ultimately, Gatsby crashes.

Steps to reproduce

1. Open gatsby-docs-kit.yml
2. Add duplicate of a key to YAML file:

items:
- title: Render component when all the permissions match
  file: permissionsMatch.md
items:
- title: Render component when one of the permissions match
  file: oneMatch.md

3. Check Gatsby console:

error UNHANDLED EXCEPTION

YAMLException: duplicated mapping key at line 29, column -102:
  items:

[piotr-s-brainhub]

@kkoscielniak

for me duplicated mapping key at line 29 provides enough info about the error

[kkoscielniak]

This info still doesn't fix the issue. The thing to resolve is quitting the gatsby itself whenever the issue with duplicated key occurs.

[RobertHebel]

This issue doesn't occur in the newest version.
Please reopen if you somehow manage to reproduce it