java.lang.IllegalArgumentException: Null argument passed to method!

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java.lang.IllegalArgumentException: Null argument passed to method!
at com.atlassian.crowd.integration.util.Null.not(
at com.atlassian.crowd.integration.osuser.CrowdCredentialsProvider.handles(
at com.opensymphony.user.UserManager.getProvider(
at com.opensymphony.user.UserManager.getEntity(
at com.opensymphony.user.UserManager.getUser(
at com.atlassian.jira.user.util.UserUtilImpl.getUser(
at com.atlassian.jira.plugin.profile.ProfileLinkUserFormat.getInitialParams(
at com.atlassian.jira.plugin.profile.ProfileLinkUserFormat.format(
at com.atlassian.jira.plugin.profile.DefaultUserFormatManager.formatUser(

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