java.lang.RuntimeException: Unable to start activity ComponentInfo{nl.hnogames.domoticz.premium/nl.hnogames.domoticz.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.support.v4.app.Fragment.toString()' on a null object reference

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Unable to start activity ComponentInfo{nl.hnogames.domoticz.premium/nl.hnogames.domoticz.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.support.v4.app.Fragment.toString()' on a null object reference
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java.lang.RuntimeException: Unable to start activity ComponentInfo{nl.hnogames.domoticz.premium/nl.hnogames.domoticz.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.support.v4.app.Fragment.toString()' on a null object reference
at nl.hnogames.domoticz.app.DomoticzDashboardFragment.onAttachFragment(DomoticzDashboardFragment.java:228)
at nl.hnogames.domoticz.app.DomoticzDashboardFragment.checkConnection(DomoticzDashboardFragment.java:257)
at nl.hnogames.domoticz.app.DomoticzDashboardFragment.onActivityCreated(DomoticzDashboardFragment.java:217)
at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1983)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1092)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1234)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2046)
at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:174)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1288)
at android.app.Activity.performStart(Activity.java:6264)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2447)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2544)
at android.app.ActivityThread.access$900(ActivityThread.java:150)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1394)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:168)
at android.app.ActivityThread.main(ActivityThread.java:5845)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)

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