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com.atlassian.jira.util.dbc.Assertions$NullArgumentException: key should not be null! at com.atlassian.jira.util.dbc.Assertions.notNull(Assertions.java:28) at com.atlassian.jira.user.DelegatingApplicationUser.<init>(DelegatingApplicationUser.java:20) at com.atlassian.jira.user.ApplicationUsers.from(ApplicationUsers.java:53) at com.atlassian.jira.avatar.AvatarServiceImpl.fromStaleUser(AvatarServiceImpl.java:56) at com.atlassian.jira.avatar.AvatarServiceImpl.getAvatarAbsoluteURL(AvatarServiceImpl.java:149) at com.atlassian.excalibur.web.util.ExcaliburWebUtil.getLargeAvatarUrl(ExcaliburWebUtil.java:225) at com.atlassian.excalibur.model.SessionStatusSessionActivityItem.<init>(SessionStatusSessionActivityItem.java:21) at com.atlassian.bonfire.service.dao.SessionMarshaller.unmarshalSessionStatusActivityItem(SessionMarshaller.java:627) at com.atlassian.bonfire.service.dao.SessionMarshaller.unmarshalSessionActivityItem(SessionMarshaller.java:567) at com.atlassian.bonfire.service.dao.SessionMarshaller.unmarshalSessionActivityItemList(SessionMarshaller.java:536) at com.atlassian.bonfire.service.dao.SessionMarshaller.unMarshal(SessionMarshaller.java:458) at com.atlassian.excalibur.service.dao.SessionDao.load(SessionDao.java:100) at com.atlassian.excalibur.service.controller.SessionControllerImpl.getActiveSession(SessionControllerImpl.java:959) at com.atlassian.excalibur.service.controller.SessionControllerImpl.validateStartSession(SessionControllerImpl.java:358) at com.atlassian.excalibur.web.ExcaliburSessionStatusAction.doActivateInSession(ExcaliburSessionStatusAction.java:60) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source)