java.lang.NullPointerException: Attempt to invoke virtual method 'void android.database.sqlite.SQLiteDatabase.execSQL(java.lang.String)' on a null object reference

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Attempt to invoke virtual method 'void android.database.sqlite.SQLiteDatabase.execSQL(java.lang.String)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.database.sqlite.SQLiteDatabase.execSQL(java.lang.String)' on a null object reference
at com.canre.backup1.DatabaseHelper.onCreate(DatabaseHelper.java:25)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251)
at com.canre.backup1.DatabaseHelper.insertData(DatabaseHelper.java:34)
at com.canre.backup1.MainActivity.onLoadFinished(MainActivity.java:58)
at com.canre.backup1.MainActivity.onLoadFinished(MainActivity.java:22)

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