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Attempt to invoke interface method 'com.owncloud.android.datamodel.FileDataStorageManager com.owncloud.android.ui.fragment.FileFragment$ContainerActivity.getStorageManager()' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'com.owncloud.android.datamodel.FileDataStorageManager com.owncloud.android.ui.fragment.FileFragment$ContainerActivity.getStorageManager()' on a null object reference	at com.owncloud.android.ui.fragment.OCFileListFragment.isGridViewPreferred(OCFileListFragment.java:790)	at com.owncloud.android.ui.fragment.OCFileListFragment.changeGridIcon(OCFileListFragment.java:835)	at com.owncloud.android.ui.fragment.OCFileListFragment.onPrepareOptionsMenu(OCFileListFragment.java:402)	at android.support.v4.app.Fragment.performPrepareOptionsMenu(Fragment.java:2058)	at android.support.v4.app.FragmentManagerImpl.dispatchPrepareOptionsMenu(FragmentManager.java:2145)	at android.support.v4.app.FragmentController.dispatchPrepareOptionsMenu(FragmentController.java:282)	at android.support.v4.app.FragmentActivity.onPreparePanel(FragmentActivity.java:477)	at android.support.v7.view.WindowCallbackWrapper.onPreparePanel(WindowCallbackWrapper.java:90)	at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.onPreparePanel(AppCompatDelegateImplBase.java:268)	at android.support.v7.view.WindowCallbackWrapper.onPreparePanel(WindowCallbackWrapper.java:90)	at android.support.v7.app.ToolbarActionBar$ToolbarCallbackWrapper.onPreparePanel(ToolbarActionBar.java:550)	at android.support.v7.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:443)	at android.support.v7.app.ToolbarActionBar$1.run(ToolbarActionBar.java:60)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)	at android.app.ActivityThread.main(ActivityThread.java:5466)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)