java.lang.NullPointerException

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    • java.lang.NullPointerException: Attempt to invoke virtual method 'boolean com.google.android.gms.common.api.GoogleApiClient.isConnected()' on a null object reference at com.myapplication.tester.BaseActivity.signOut(BaseActivity.java:190) at com.myapplication.tester.BaseActivity.onOptionsItemSelected(BaseActivity.java:180) at android.app.Activity.onMenuItemSelected(Activity.java:2948) at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:406) at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:195) at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:103) at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:103) at android.support.v7.app.ToolbarActionBar$2.onMenuItemClick(ToolbarActionBar.java:69) at android.support.v7.widget.Toolbar$1.onMenuItemClick(Toolbar.java:203) at android.support.v7.widget.ActionMenuView$MenuBuilderCallback.onMenuItemSelected(ActionMenuView.java:759) at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:810) at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152) at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:957) at android.support.v7.view.menu.MenuPopup.onItemClick(MenuPopup.java:127) at android.widget.AdapterView.performItemClick(AdapterView.java:310)
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