Fix Null Object Reference Error in Android Navigation Drawer Fragment

Fix Null Object Reference Error in Android Navigation Drawer Fragment

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Attempt to Invoke Virtual Method androidx.appcompat.app.ActionBar.hide() on a Null Object Reference
Attempt to Invoke Virtual Method androidx.appcompat.app.ActionBar.hide() on a Null Object Reference
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Attempt to Invoke Virtual Method androidx.appcompat.app.ActionBar.hide() on a Null Object Reference

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Android : Android Error [Attempt to invoke virtual method 'void android.app.ActionBar' on a null obj
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Fixed Error android error attempt to invoke virtual method | Null object reference | #android

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