Someone in my organization did the following: Dashboard | Find Issues | View All Projects | Sort on Key

They received an error page back that said:

? An error occurred searching: java.lang.NullPointerException
? An error occurred searching: java.lang.NullPointerException

From catalina.out:

2003-05-09 12:04:21,823 ERROR [web.action.issue.IssueNavigator] An error occurred searching: com.atlassian.jira.issue.search.SearchException
java.lang.NullPointerException
at java.lang.String.compareTo(String.java:797)
at com.atlassian.jira.issue.comparator.KeyComparator.compare(KeyComparat
or.java:43)
at org.apache.commons.collections.comparators.ComparatorChain.compare(Un
known Source)
at java.util.Arrays.mergeSort(Arrays.java:1181)
at java.util.Arrays.mergeSort(Arrays.java:1188)
at java.util.Arrays.mergeSort(Arrays.java:1189)
at java.util.Arrays.mergeSort(Arrays.java:1188)
at java.util.Arrays.mergeSort(Arrays.java:1189)
at java.util.Arrays.mergeSort(Arrays.java:1189)
at java.util.Arrays.mergeSort(Arrays.java:1189)
at java.util.Arrays.mergeSort(Arrays.java:1189)
at java.util.Arrays.sort(Arrays.java:1128)
at java.util.Collections.sort(Collections.java:121)
at com.atlassian.jira.issue.search.providers.DefaultSearchProvider.searc
h(DefaultSearchProvider.java:64)
at com.atlassian.jira.issue.managers.DefaultIssueManager.execute(Default
IssueManager.java:134)
at com.atlassian.jira.issue.managers.CachingIssueManager.execute(Caching
IssueManager.java:82)
at com.atlassian.jira.web.action.issue.IssueNavigator.getBrowsableItems(
IssueNavigator.java:279)
at com.atlassian.jira.web.action.issue.IssueNavigator.doExecute(IssueNav
igator.java:177)
at webwork.action.ActionSupport.execute(ActionSupport.java:114)
...