NullPointerException in CookieUtils

[2006/06/06 16:32:39.835] WARN  [Atlassian JIRA Web Application] /bugs/browse/INF-44?os_username=***&os_password=***: 
java.lang.NullPointerException
        at com.atlassian.jira.web.util.CookieUtils.getSingleSessionId(CookieUtils.java:33)
        at org.apache.jsp.includes.panels.issue.operations_jsp._jspService(operations_jsp.java:269)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
        at javax.servlet.http.HttpServlet.service(Unknown Source)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
        at javax.servlet.http.HttpServlet.service(Unknown Source)
        at org.mortbay.jetty.servlet.ServletHolder.handle(Unknown Source)
        at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(Unknown Source)
        at org.mortbay.jetty.servlet.Dispatcher.dispatch(Unknown Source)
        at org.mortbay.jetty.servlet.Dispatcher.include(Unknown Source)
        at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
        at org.apache.jsp.includes.panels.issue.summary_jsp._jspService(summary_jsp.java:225)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
        at javax.servlet.http.HttpServlet.service(Unknown Source)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
        at javax.servlet.http.HttpServlet.service(Unknown Source)
        at org.mortbay.jetty.servlet.ServletHolder.handle(Unknown Source)
        ...

    public static String getSingleSessionId(Cookie[] cookies)
    {
        if (cookies == null) return null;
        String sessionId = null;
        boolean foundOnlyOneSessionId = false;
        for (int i = 0; i < cookies.length; i++)
....