#fixed code
                             @Override
	public void renameField(net.runelite.deob.Field f, Field newField)
	{
		net.runelite.deob.Field f2 = getMyField();
		
		if (f2 == f)
			field = newField;
	}
#vulnerable code 
                             @Override
	public void renameField(net.runelite.deob.Field f, Field newField)
	{
		Class clazz = field.getClassEntry();
		NameAndType nat = field.getNameAndType();

		ClassFile cf = this.getInstructions().getCode().getAttributes().getClassFile().getGroup().findClass(clazz.getName());
		if (cf == null)
			return;

		net.runelite.deob.Field f2 = cf.findFieldDeep(nat);
		assert f2 != null;
		
		if (f2 == f)
			field = newField;
	} 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE