Error with FCKeditor.Java and Safari

java.lang.NumberFormatException: For input string: "version"
    at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
    at java.lang.Double.parseDouble(Unknown Source)
    at com.fredck.FCKeditor.FCKeditor.retrieveBrowserVersion(FCKeditor.java:264)
    at com.fredck.FCKeditor.FCKeditor.isCompatible(FCKeditor.java:251)
    at com.fredck.FCKeditor.FCKeditor.create(FCKeditor.java:292)
    at com.fredck.FCKeditor.tags.FCKeditorTag.doAfterBody(FCKeditorTag.java:689)
    at org.apache.jsp.content.admin.includes.editor.editor_002dform_jsp._jspx_meth_FCK_005feditor_005f0(editor_002dform_jsp.java:267)
    at org.apache.jsp.content.admin.includes.editor.editor_002dform_jsp._jspx_meth_html_005fform_005f0(editor_002dform_jsp.java:141)
    at org.apache.jsp.content.admin.includes.editor.editor_002dform_jsp._jspService(editor_002dform_jsp.java:86)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:557)
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:481)
    at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968)
    at org.apache.jasper.runtime.PageContextImpl.doInclude(PageContextImpl.java:638)
    at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:632)
    at sun.reflect.GeneratedMethodAccessor129.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:129)
    at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:152)
    at org.apache.struts.tiles.taglib.InsertTag.doInclude(InsertTag.java:764)
    at org.apache.struts.tiles.taglib.InsertTag$InsertHandler.doEndTag(InsertTag.java:896)
    at org.apache.struts.tiles.taglib.InsertTag.doEndTag(InsertTag.java:465)
    ...

   private double retrieveBrowserVersion(String userAgent) {
      if(userAgent.indexOf("msie")>-1) {
         String str = userAgent.substring(userAgent.indexOf("msie") + 5);
         return Double.parseDouble(str.substring(0, str.indexOf(";")));
      }
      else {
         String str = userAgent.substring(userAgent.indexOf("gecko") + 6);
         return Double.parseDouble(str.substring(0, 8));
      }
   }