java.lang.IllegalArgumentException: data may not be null

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java.lang.IllegalArgumentException: data may not be null
at org.apache.commons.httpclient.util.EncodingUtil.getBytes(EncodingUtil.java:203)
at org.apache.commons.httpclient.util.URIUtil.encode(URIUtil.java:502)
at com.atlassian.crowd.openid.server.provider.LoginParameterMessage.formatUrlTemplate(LoginParameterMessage.java:50)

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