java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at org.sonar.plugins.ldap.LdapSearch.find(LdapSearch.java:126)
at org.sonar.plugins.ldap.LdapSearch.findUnique(LdapSearch.java:143)
at org.sonar.plugins.ldap.LdapUsersProvider.doGetUserDetails(LdapUsersProvider.java:77)
at org.sonar.server.authentication.RealmAuthenticator.doAuthenticate(RealmAuthenticator.java:89)
at org.sonar.server.authentication.RealmAuthenticator.authenticate(RealmAuthenticator.java:83)
at org.sonar.server.authentication.CredentialsAuthenticator.authenticate(CredentialsAuthenticator.java:56)
at org.sonar.server.authentication.CredentialsAuthenticator.authenticate(CredentialsAuthenticator.java:45)
at org.sonar.server.authentication.ws.LoginAction.authenticate(LoginAction.java:91)
at org.sonar.server.authentication.ws.LoginAction.doFilter(LoginAction.java:76)
at org.sonar.server.platform.MasterServletFilter$GodFilterChain.doFilter(MasterServletFilter.java:125)
at org.sonar.server.platform.MasterServletFilter.doFilter(MasterServletFilter.java:94)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.sonar.server.user.UserSessionFilter.doFilter(UserSessionFilter.java:56)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.sonar.server.platform.RoutesFilter.doFilter(RoutesFilter.java:55)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.sonar.server.platform.ProfilingFilter.doFilter(ProfilingFilter.java:84)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.lang.Thread.run(Unknown Source)

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