java.lang.StringIndexOutOfBoundsException: String index out of range: 0

[Gilberto C. Andrade]

[environment]
[EMAIL PROTECTED]:~> mvn -v
Maven version: 2.0.9
Java version: 1.5.0_15
OS name: "linux" version: "2.6.22.19-3-default" arch: "i386" Family: "unix"
[EMAIL PROTECTED]:~> ll .m2/repository/net/sf/click/click/1.5/
total 2036
drwxr-xr-x 2 gilberto users    4096 2008-11-03 09:31 .
drwxr-xr-x 8 gilberto users    4096 2008-11-03 09:30 ..
-rw-r--r-- 1 gilberto users 2059523 2008-11-03 09:31 click-1.5.jar
-rw-r--r-- 1 gilberto users      40 2008-11-03 09:31 click-1.5.jar.sha1
-rw-r--r-- 1 gilberto users    2775 2008-11-03 09:30 click-1.5.pom
-rw-r--r-- 1 gilberto users      40 2008-11-03 09:30 click-1.5.pom.sha1
[EMAIL PROTECTED]:~>
[/environment]

Hi, congratulations for final release!

I'm getting this exception:

DEBUG - BaseService.insert(128) | Inserção realizada com sucesso.
DEBUG - EditUnidadeMedida.onOkClick(88) | Operação de inserção realizada.
[Click] [error] handleException:
java.lang.StringIndexOutOfBoundsException: String index out of range:
0
        at java.lang.String.charAt(String.java:558)
        at net.sf.click.Page.setRedirect(Page.java:982)
        at 
com.gilbertoca.gfi.page.EditUnidadeMedida.onOkClick(EditUnidadeMedida.java:92)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at net.sf.click.util.ClickUtils.invokeListener(ClickUtils.java:1532)
        at 
net.sf.click.util.ActionListenerAdaptor.onAction(ActionListenerAdaptor.java:43)
        at 
net.sf.click.ControlRegistry.fireActionEvents(ControlRegistry.java:147)
        at net.sf.click.ClickServlet.processPage(ClickServlet.java:563)
        at net.sf.click.ClickServlet.handleRequest(ClickServlet.java:331)
        at net.sf.click.ClickServlet.doPost(ClickServlet.java:267)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
        at 
net.sf.click.extras.filter.CompressionFilter.doFilter(CompressionFilter.java:188)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
        at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
        at 
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
        at 
org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:324)
        at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
        at 
org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:842)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
        at 
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
        at 
org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
[Click] [info ] renderTemplate: /click/error.htm - 10 ms
[Click] [info ] handleRequest:  /edit-unidade-medida.htm - 776 ms

Here is my code:

            String referrer = referrerField.getValue();
            if (referrer != null) {
                setRedirect(referrer); <===============================
            } else {
                setRedirect(HomePage.class);
            }
            return true;

Thanks in advance,

Gilberto