NullPointerException when getting information from Perforce repository

2011-05-25 14:40:48,892 ERROR [btpool0-5 ] org.mortbay.log org.mortbay.log.Slf4jLog-warn - /browse/P4repo/dir1/dir2/filename.rb
java.lang.NullPointerException
	at com.cenqua.fisheye.perforce.client.P4Client.getBlame(P4Client.java:511)
	at com.cenqua.fisheye.perforce.P4Cache.getBlameFallback(P4Cache.java:328)
	at com.cenqua.fisheye.cache.BaseRevisionCache.getBlame(BaseRevisionCache.java:571)
	at com.cenqua.fisheye.web.ViewFileAction.getBlame(ViewFileAction.java:460)
	at com.cenqua.fisheye.web.ViewFileAction.doFile(ViewFileAction.java:320)
	at com.cenqua.fisheye.web.ViewFileAction.handleDoFileRequest(ViewFileAction.java:241)
	at com.cenqua.fisheye.web.ViewFileAction.handleFileRequest(ViewFileAction.java:229)
	at com.cenqua.fisheye.web.ViewFileAction.handleRequest(ViewFileAction.java:143)
	at com.cenqua.fisheye.web.BaseAction.processRequest(BaseAction.java:247)
	at com.cenqua.fisheye.web.ActionDispatcherServlet.doIt(ActionDispatcherServlet.java:237)
	at com.cenqua.fisheye.web.ActionDispatcherServlet.doGet(ActionDispatcherServlet.java:68)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)