NullPointerException in Knowledge Base Search widget

Issue

• Steps to reproduce:
  1. Start Liferay DXP 7.4
  2. Create a page and add a 'Knowledge Base Search' widget on the page.
  3. Input any keyword into the search bar and hit Search.
  Expected Behavior: Knowledge Base search must work properly and show the result.
  Actual Behavior: Knowledge Base Search is temporarily unavailable' showing on the page and NullPointerException in the logs.

Environment

• Liferay DXP 7.4

Resolution

• The observed behavior is a known issue/bug. And, it is fixed in Liferay DXP 7.4 Update-32.
• If a hotfix is required for this issue, please create a support ticket requesting a hotfix by attaching patch details.
• Installing Fix Packs and Hotfixes on Liferay DXP will guide to installation of the hotfix in the respective environment.

Additional Information

• LPS-155924