Seen multiple times on extranet.

Stack trace:

2006-07-05 20:53:47,246 ERROR [opensymphony.webwork.dispatcher.ServletDispatcher
] serviceAction Could not execute action
java.lang.NullPointerException
at com.atlassian.confluence.user.actions.AbstractUserProfileAction.getPe
rsonalSpaceKey(AbstractUserProfileAction.java:425)
at com.atlassian.confluence.user.actions.AbstractUserProfileAction.getSp
ace(AbstractUserProfileAction.java:420)
at com.atlassian.confluence.security.actions.PermissionCheckInterceptor.
intercept(PermissionCheckInterceptor.java:39)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionIn
vocation.java:165)
at com.atlassian.confluence.pages.actions.PageAwareInterceptor.intercept
(PageAwareInterceptor.java:114)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionIn
vocation.java:165)
at com.atlassian.confluence.spaces.actions.SpaceAwareInterceptor.interce
pt(SpaceAwareInterceptor.java:67)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionIn
vocation.java:165)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(Around
Interceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionIn
vocation.java:165)

Corresponding web request:

203.14.171.190 - - [05/Jul/2006:20:53:46 -0500] "GET /display/~mike/2006/06/23/I
nternal+blog+stats...+generated+by+Confluence%21/images/icons/blogentry_16.gif H
TTP/1.1" 503 16252 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;
.NET CLR 1.1.4322; .NET CLR 2.0.50727)"
203.14.171.190 - - [05/Jul/2006:20:53:46 -0500] "GET /display/~mike/2006/06/23/I
nternal+blog+stats...+generated+by+Confluence%21/download/temp/chart66525.png?co
ntentType=image/png&delete=true HTTP/1.1" 503 16252 "-" "Mozilla/4.0 (compatible
; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"
203.14.171.190 - - [05/Jul/2006:20:53:47 -0500] "GET /display/~mike/2006/06/23/I
nternal+blog+stats...+generated+by+Confluence%21/download/temp/chart66526.png?co
ntentType=image/png&delete=true HTTP/1.1" 503 16252 "-" "Mozilla/4.0 (compatible
; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"