Manage Groups NullPointerException

Upgraded from Confluence 2.4.4 to 2.5.

When managing groups and clicking on the group title to see which users belong to that group, I get a NullPointerException error. When I create a new group and click on that group title, the listing works by showing no users. As soon as I assign a user the new group, going back to Manage Groups and clicking on the group title gives me a NullPointerException error.

This means any group with users assigned to it would give me that error.

org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getPage' in class com.atlassian.confluence.user.UsernameToUserTranslatingPaginationSupport threw exception class java.lang.NullPointerException : null
at org.apache.velocity.runtime.parser.node.PropertyExecutor.execute(PropertyExecutor.java:188)
caused by: java.lang.NullPointerException
at com.atlassian.confluence.user.UsernameToUserTranslatingPaginationSupport.getPage(UsernameToUserTranslatingPaginationSupport.java:32)