I tried to build several maven projects with Hudson 1.87, but I get this error:

started
[] $ /opt/jdk1.5.0_10/jre/bin/java -cp
/home/tascheb/Java/apache-tomcat-5.5.20/webapps/hudson/WEB-INF/lib/maven-agent-1.87.jar:/opt/maven/core/boot/classworlds-1.1.jar
hudson.maven.agent.Main /opt/maven
/home/tascheb/Java/apache-tomcat-5.5.20/webapps/hudson/WEB-INF/lib/hudson-core-1.87.jar
/home/tascheb/Java/apache-tomcat-5.5.20/webapps/hudson/WEB-INF/lib/maven-interceptor-1.87.jar
channel started
FATAL: null
java.lang.NullPointerException
at hudson.maven.agent.Main.launch(Main.java:65)
at hudson.maven.MavenBuild$Builder.call(MavenBuild.java:127)
at hudson.maven.MavenBuild$Builder.call(MavenBuild.java:105)
at hudson.remoting.UserRequest.perform(UserRequest.java:57)
at hudson.remoting.UserRequest.perform(UserRequest.java:22)
at hudson.remoting.Request$2.run(Request.java:178)
at
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665)
at
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690)
at java.lang.Thread.run(Thread.java:595)