You can get a blue, red or green pixel from the Powerful Glove in Exploathing, and this gives a null pointer when it occurs.
Code:
class java.lang.NullPointerException: null
java.lang.NullPointerException
at net.sourceforge.kolmafia.webui.UseLinkDecorator.getNavigationLink(UseLinkDecorator.java:1778)
at net.sourceforge.kolmafia.webui.UseLinkDecorator.generateUseLink(UseLinkDecorator.java:630)
at net.sourceforge.kolmafia.webui.UseLinkDecorator.addUseLink(UseLinkDecorator.java:583)
at net.sourceforge.kolmafia.webui.UseLinkDecorator.addNormalUseLinks(UseLinkDecorator.java:322)
at net.sourceforge.kolmafia.webui.UseLinkDecorator.decorate(UseLinkDecorator.java:151)
at net.sourceforge.kolmafia.RequestEditorKit.applyGlobalAdjustments(RequestEditorKit.java:654)
at net.sourceforge.kolmafia.RequestEditorKit.getFeatureRichHTML(RequestEditorKit.java:319)
at net.sourceforge.kolmafia.RequestEditorKit.getFeatureRichHTML(RequestEditorKit.java:290)
at net.sourceforge.kolmafia.RequestEditorKit.getFeatureRichHTML(RequestEditorKit.java:224)
at net.sourceforge.kolmafia.request.FightRequest.processResults(FightRequest.java:2157)
at net.sourceforge.kolmafia.request.GenericRequest.parseResults(GenericRequest.java:2928)
at net.sourceforge.kolmafia.request.GenericRequest.processResponse(GenericRequest.java:2660)
at net.sourceforge.kolmafia.request.GenericRequest.retrieveServerReply(GenericRequest.java:2568)
at net.sourceforge.kolmafia.request.GenericRequest.retrieveServerReply(GenericRequest.java:2116)
at net.sourceforge.kolmafia.request.GenericRequest.externalExecute(GenericRequest.java:1674)
at net.sourceforge.kolmafia.request.GenericRequest.execute(GenericRequest.java:1657)
at net.sourceforge.kolmafia.request.GenericRequest.run(GenericRequest.java:1368)
at net.sourceforge.kolmafia.request.RelayRequest.run(RelayRequest.java:3738)
at net.sourceforge.kolmafia.RequestThread.postRequest(RequestThread.java:300)
at net.sourceforge.kolmafia.RequestThread.postRequest(RequestThread.java:250)
at net.sourceforge.kolmafia.textui.RuntimeLibrary.visit_url(RuntimeLibrary.java:2887)
at jdk.internal.reflect.GeneratedMethodAccessor200.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at net.sourceforge.kolmafia.textui.parsetree.LibraryFunction.execute(LibraryFunction.java:112)
at net.sourceforge.kolmafia.textui.parsetree.FunctionCall.execute(FunctionCall.java:160)
at net.sourceforge.kolmafia.textui.parsetree.Assignment.execute(Assignment.java:103)
at net.sourceforge.kolmafia.textui.parsetree.BasicScope.execute(BasicScope.java:565)
at net.sourceforge.kolmafia.textui.parsetree.UserDefinedFunction.execute(UserDefinedFunction.java:137)
at net.sourceforge.kolmafia.textui.Interpreter.executeScope(Interpreter.java:421)
at net.sourceforge.kolmafia.textui.Interpreter.execute(Interpreter.java:342)
at net.sourceforge.kolmafia.textui.Interpreter.execute(Interpreter.java:335)
at net.sourceforge.kolmafia.KoLmafiaASH.getClientHTML(KoLmafiaASH.java:188)
at net.sourceforge.kolmafia.KoLmafiaASH.getClientHTML(KoLmafiaASH.java:157)
at net.sourceforge.kolmafia.KoLmafiaASH.getClientHTML(KoLmafiaASH.java:129)
at net.sourceforge.kolmafia.request.RelayRequest.run(RelayRequest.java:3638)
at net.sourceforge.kolmafia.RequestThread.postRequest(RequestThread.java:300)
at net.sourceforge.kolmafia.RequestThread.postRequest(RequestThread.java:250)
at net.sourceforge.kolmafia.webui.RelayAgent.readServerResponse(RelayAgent.java:596)
at net.sourceforge.kolmafia.webui.RelayAgent.performRelay(RelayAgent.java:162)
at net.sourceforge.kolmafia.webui.RelayAgent.run(RelayAgent.java:135)