java.lang.NullPointerException
   at org.netbeans.api.java.source.SourceUtils.getDependentRootsImpl(SourceUtils.java:728)
   at org.netbeans.api.java.source.SourceUtils.getDependentRoots(SourceUtils.java:717)
   at org.netbeans.modules.debugger.jpda.projects.MainProjectManager.isDependent(MainProjectManager.java:163)
   at org.netbeans.modules.debugger.jpda.projects.MainProjectManager.getMainProject(MainProjectManager.java:112)
   at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider.shouldBeEnabled(StepIntoActionProvider.java:144)
   at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider.access$200(StepIntoActionProvider.java:73)
   at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider$Listener.doSetEnabled(StepIntoActionProvider.java:194)
   at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider$Listener.engineRemoved(StepIntoActionProvider.java:190)
Caused: java.lang.reflect.InvocationTargetException
   at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:0)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:451)
Caused: java.lang.reflect.UndeclaredThrowableException
   at $Proxy8.engineRemoved(.java:0)
   at org.netbeans.api.debugger.DebuggerManager.fireEngineRemoved(DebuggerManager.java:1361)
   at org.netbeans.api.debugger.DebuggerManager.removeEngine(DebuggerManager.java:1545)
   at org.netbeans.api.debugger.Session.removeEngine(Session.java:444)
   at org.netbeans.api.debugger.DebuggerEngine$Destructor.killEngine(DebuggerEngine.java:238)
   at org.netbeans.modules.web.client.javascript.debugger.actions.NbJSDebuggerActionsProvider$JSDebuggerEventListenerImpl.onDebuggerEvent(NbJSDebuggerActionsProvider.java:126)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:0)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:451)
   at $Proxy25.onDebuggerEvent(.java:0)
   at org.netbeans.modules.web.client.javascript.debugger.api.NbJSDebugger.fireJSDebuggerEvent(NbJSDebugger.java:480)
   at org.netbeans.modules.web.client.javascript.debugger.api.NbJSDebugger.setState(NbJSDebugger.java:580)
   at org.netbeans.modules.web.client.javascript.debugger.api.NbJSDebugger$JSDebuggerEventListenerImpl.onDebuggerEvent(NbJSDebugger.java:149)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:0)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:451)
   at $Proxy25.onDebuggerEvent(.java:0)
   at org.netbeans.modules.web.client.tools.javascript.debugger.spi.JSAbstractDebugger.fireJSDebuggerEvent(JSAbstractDebugger.java:259)
   at org.netbeans.modules.web.client.tools.javascript.debugger.spi.JSAbstractDebugger.setDebuggerState(JSAbstractDebugger.java:149)
   at org.netbeans.modules.web.client.tools.javascript.debugger.spi.JSAbstractExternalDebugger$SuspensionPointHandler.handle(JSAbstractExternalDebugger.java:472)
   at org.netbeans.modules.web.client.tools.javascript.debugger.spi.JSAbstractExternalDebugger$SuspensionPointHandler.run(JSAbstractExternalDebugger.java:431)