Traceability Report error when using defects from another project

Description
When generating a Traceability report where we have a defect on project B and the user does not have browse permission, we get a 500 error.

Pre-conditions
Login with a user with browse permission on Project A but not on Project B

How to reproduce
1. Project A -> Create Requirement

2. Project A -> Create Test issue

3. Project A -> Create Test Execution issue

4. Execute and create a defect on Project B

5. Generate report.

Actual result/Attachments
we get an error:
error: {"status-code":500,"stack-trace":"java.lang.NullPointerException\n\tat com.xpandit.raven.reports.traceability.service.TraceabilityReportDataProviderImpl.a(Unknown Source)

Expected result
Should be able to generate the Report