NPE when display single JIRA issue link with anonymous user

Here are the steps to reproduce:

1. Install JIRA 6.1.x or later and Confluence 5.4.x or later.
2. Set up the application links between JIRA and Confluence with trusted applications and Oauth using the option "Allow user impersonation through 2-Legged OAuth".
3. Create project TEST with one issue TEST-1. JIRA and project do not have anonymous access.
4. Create a new space on Confluence with anonymous access.
5. Copy the issue link and parse the link to an empty page.
6. Try to open the page with anonymous user. Then got the error:

   com.atlassian.confluence.macro.MacroExecutionException: java.lang.NullPointerException
   

If switch the single issue link to a table view by change the JQL, the NullPointerException is gone.