script toLowerCase error

I am using HttpUnit 1.7. I am encountering the following error when invoking WebConversation.getResponse().

I omitted the actual script, but it uses toLowerCase as a means of determining the browser version.

Any help with this would be greatly appreciated.

Woody

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com.meterware.httpunit.ScriptException: Script failed: org.mozilla.javascript.EcmaError: TypeError: Cannot call method "toLowerCase" of undefined (httpunit#39)
 at com.meterware.httpunit.javascript.ScriptingEngineImpl.handleScriptException(ScriptingEngineImpl.java:64)
 at com.meterware.httpunit.javascript.ScriptingEngineImpl.runScript(ScriptingEngineImpl.java:95)
 at com.meterware.httpunit.scripting.ScriptableDelegate.runScript(ScriptableDelegate.java:88)
 at com.meterware.httpunit.parsing.NekoDOMParser.runScript(NekoDOMParser.java:151)
 at com.meterware.httpunit.parsing.ScriptFilter.getTranslatedScript(ScriptFilter.java:150)
 at com.meterware.httpunit.parsing.ScriptFilter.endElement(ScriptFilter.java:131)
 at org.cyberneko.html.filters.DefaultFilter.endElement(DefaultFilter.java:249)
 at org.cyberneko.html.filters.NamespaceBinder.endElement(NamespaceBinder.java:367)
 at org.cyberneko.html.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1015)
 at org.cyberneko.html.HTMLTagBalancer.endElement(HTMLTagBalancer.java:888)
 at org.cyberneko.html.HTMLScanner$SpecialScanner.scan(HTMLScanner.java:2831)
 at org.cyberneko.html.HTMLScanner.scanDocument(HTMLScanner.java:809)
 at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:478)
 at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:431)
 at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
 at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
 at com.meterware.httpunit.parsing.NekoHTMLParser.parse(NekoHTMLParser.java:48)
 at com.meterware.httpunit.HTMLPage.parse(HTMLPage.java:271)
 at com.meterware.httpunit.WebResponse.getReceivedPage(WebResponse.java:1301)
 at com.meterware.httpunit.WebResponse.getFrames(WebResponse.java:1285)
 at com.meterware.httpunit.WebResponse.getFrameRequests(WebResponse.java:1024)
 at com.meterware.httpunit.FrameHolder.updateFrames(FrameHolder.java:179)
 at com.meterware.httpunit.WebWindow.updateFrameContents(WebWindow.java:315)
 at com.meterware.httpunit.WebClient.updateFrameContents(WebClient.java:526)
 at com.meterware.httpunit.WebWindow.updateWindow(WebWindow.java:201)
 at com.meterware.httpunit.WebWindow.getSubframeResponse(WebWindow.java:183)
 at com.meterware.httpunit.WebWindow.getResponse(WebWindow.java:158)
 at com.meterware.httpunit.WebWindow.getResponse(WebWindow.java:125)
 at com.meterware.httpunit.WebClient.getResponse(WebClient.java:96)
 at com.ibm.commerce.sample.Sample.test2(Sample.java:109)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
 at java.lang.reflect.Method.invoke(Method.java:391)
 at junit.framework.TestCase.runTest(TestCase.java:154)
 at junit.framework.TestCase.runBare(TestCase.java:127)
 at junit.framework.TestResult$1.protect(TestResult.java:106)
 at junit.framework.TestResult.runProtected(TestResult.java:124)
 at junit.framework.TestResult.run(TestResult.java:109)
 at junit.framework.TestCase.run(TestCase.java:118)
 at junit.framework.TestSuite.runTest(TestSuite.java:208)
 at junit.framework.TestSuite.run(TestSuite.java:203)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:436)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:311)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

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