Issue Summary

This is reproducible on Data Center: yes

Steps to Reproduce

1. Create a plan in Bamboo having 2 different linked repositories.
2. Create one source code checkout task and add checkout for both the repositories in the same task.
3. Delete one repository from the repositories tab for this plan.
4. Click on Actions > View plan as Java Specs or Actions > View plan as YAML

Expected Results

The plan's metadata should get displayed.

Actual Results

Below error is throw on the Bamboo UI

java.lang.IllegalStateException: Repository with ID 999999999 does not exist
	at com.google.common.base.Preconditions.checkState(Preconditions.java:576)
	at com.atlassian.bamboo.task.export.AbstractRepositoryAwareTaskExporter.getNonDefaultRepositoryRef(AbstractRepositoryAwareTaskExporter.java:74)
	at com.atlassian.bamboo.task.export.AbstractRepositoryAwareTaskExporter.getNonDefaultRepositoryRef(AbstractRepositoryAwareTaskExporter.java:58)
	at com.atlassian.bamboo.plugins.vcs.task.export.VcsCheckoutTaskExporter.lambda$toSpecsEntity$0(VcsCheckoutTaskExporter.java:105)

Workaround

Goto Source code checkout task and look for duplicate repositories checkouts which are present and remove one of them, see below attachment as one of the example.

Note : The deleted repository is replaced with the default repository in the example above