java.lang.NullPointerException
   at org.netbeans.modules.php.dbgp.models.VariablesModel$AbstractVariableNode.collectUpdates(VariablesModel.java:536)
   at org.netbeans.modules.php.dbgp.models.nodes.AbstractModelNode.updateExistedChildren(AbstractModelNode.java:163)
   at org.netbeans.modules.php.dbgp.models.VariablesModel$AbstractVariableNode.collectUpdates(VariablesModel.java:561)
   at org.netbeans.modules.php.dbgp.models.nodes.AbstractModelNode.updateExistedChildren(AbstractModelNode.java:163)
   at org.netbeans.modules.php.dbgp.models.VariablesModel$ContextNode.collectUpdates(VariablesModel.java:508)
   at org.netbeans.modules.php.dbgp.models.VariablesModel.updateContext(VariablesModel.java:410)
   at org.netbeans.modules.php.dbgp.models.VariablesModel.updateContext(VariablesModel.java:319)
   at org.netbeans.modules.php.dbgp.packets.ContextGetResponse.process(ContextGetResponse.java:98)
   at org.netbeans.modules.php.dbgp.DebugSession.handleMessage(DebugSession.java:286)
   at org.netbeans.modules.php.dbgp.DebugSession.receiveData(DebugSession.java:262)
   at org.netbeans.modules.php.dbgp.DebugSession.sendCommands(DebugSession.java:208)
   at org.netbeans.modules.php.dbgp.DebugSession.run(DebugSession.java:139)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
   at java.util.concurrent.FutureTask.run(FutureTask.java:138)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
   at java.lang.Thread.run(Thread.java:619)