Error message when we try remove agentgroup.

Hi friends. 
We need  helps with a stranger error.

So... We receive an "NullPointerException" error message when we try remove agentgroup. 

StackTrace

java.lang.NullPointerException
at com.dynatrace.diagnostics.client.domain.configuration.application.SystemProfileManipulation.matches(SystemProfileManipulation.java:375)
at com.dynatrace.diagnostics.client.domain.configuration.application.SystemProfileManipulation.tasksExistForAgentGroup(SystemProfileManipulation.java:364)
at com.dynatrace.diagnostics.client.domain.configuration.application.SystemProfileManipulation.deleteAgentGroup(SystemProfileManipulation.java:302)
at com.dynatrace.diagnostics.client.domain.configuration.application.SystemProfilePreferencesDialog$7.privateRun(SystemProfilePreferencesDialog.java:1712)
at com.dynatrace.diagnostics.sdk.ui.utils.SecureAction.run(SourceFile:100)
at com.dynatrace.diagnostics.client.domain.configuration.application.SystemProfilePreferencesDialog$3.widgetSelected(SystemProfilePreferencesDialog.java:1229)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:234)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
at org.eclipse.jface.window.Window.open(Window.java:801)
at com.dynatrace.diagnostics.sdk.ui.dialogs.ConfigurationDialog.open(SourceFile:225)
at com.dynatrace.diagnostics.client.domain.configuration.application.SystemProfilePreferencesDialog.openContent(SystemProfilePreferencesDialog.java:1363)
at com.dynatrace.diagnostics.client.domain.configuration.application.EditSystemProfilePreferencesAction.editSystemProfilePreferences(EditSystemProfilePreferencesAction.java:728)
at com.dynatrace.diagnostics.client.domain.configuration.application.EditSystemProfilePreferencesAction$4.handleReturnValueInUI(EditSystemProfilePreferencesAction.java:353)
at com.dynatrace.diagnostics.client.domain.configuration.application.EditSystemProfilePreferencesAction$4.handleReturnValueInUI(EditSystemProfilePreferencesAction.java:298)
at com.dynatrace.diagnostics.client.communication.UiSynchedCallListener$1.run(UiSynchedCallListener.java:33)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at com.dynatrace.diagnostics.client.Client.start(Client.java:720)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
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:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
at org.eclipse.equinox.launcher.Main.main(Main.java:1384)

no more agent mappping...
We want delete this.  

Thanks

Léo Andrade