NPE is thrown when navigating to second SP

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.4.1 CE GA2, Master
• Component/s: Application Security > SAML
• Labels:
  • 7.4
  • 7.4-known-issues
  • QA-AUTOMATION
  • liferay-ga3-ce-742
• Story Points: 5
• Fix Priority: 4
• Sprint: AppSec Iteration 64
• Git Pull Request: https://github.com/liferay-appsec/liferay-portal/pull/392
• QA Test Name:
  • LocalFile.SAML#ViewSingleLogoutAndForceAuthWithMultipleSPs
• QA Test Score: 4

Steps:

1. Login localhost:9080.
2. Create two virtual instance named as www.able.com and www.baker.com.
3. Login www.able.com:9080 and edit the admin user's email as [email protected]
4. Login www.baker.com:9080 and edit the admin user's email as [email protected]
5. Configure localhost:8080 as IdP.
6. Configure www.able.com:9080 and www.baker.com:9080 as SPs.
7. Configure 1 IdP and 2 SPs.
8. Sign in to first SP www.able.com:9080.
9. Navigate to IdP.
10. Assert IdP is logged in.
11. Navigate to the second SP www.baker.com:9080.
12. Click sign in button.

Actual Result:
The second SP is login with the following error shows up in page

Unable to process SAML request. 

and NPE occurs in the console log:

2021-06-01 07:15:29.668 ERROR [http-nio-8080-exec-8][BaseSamlStrutsAction:66] java.lang.NullPointerException

Expected result:
User should be able prompted to sign in on second SP without errors.