Authentication of client applications against Crowd fails with NullPointerException

2008-05-26 08:48:27.145234500 java.lang.NullPointerException
2008-05-26 08:48:27.145235500 at com.atlassian.crowd.authentication.TokenGenerator.isTrustedProxy(TokenGenerator.java:197)
2008-05-26 08:48:27.145236500 at com.atlassian.crowd.authentication.TokenGenerator.addValidationFactors(TokenGenerator.java:140)
2008-05-26 08:48:27.145237500 at com.atlassian.crowd.authentication.TokenGenerator.generate(TokenGenerator.java:58)
2008-05-26 08:48:27.145330500 at com.atlassian.crowd.model.token.Token.<init>(Token.java:67)
2008-05-26 08:48:27.145331500 at com.atlassian.crowd.manager.GenericManager.genericValidateToken(GenericManager.java:118)
2008-05-26 08:48:27.145332500 at com.atlassian.crowd.manager.application.ApplicationManagerGeneric.validateToken(ApplicationManagerGeneric.java:2056)
2008-05-26 08:48:27.145334500 at com.atlassian.crowd.service.soap.SecurityServerGeneric.isValidPrincipalToken(SecurityServerGeneric.java:186)
2008-05-26 08:48:27.145343500 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)