那位大侠帮我看看这个存储过程有啥问题没
本人不太懂存储过程，请大侠帮忙看看这个存储过程有啥问题没，现在有个问题就是执行该存储过程程序报错“未将对象引用设置到对象的实例”存储过程如下，看看该如何修改，麻烦指点
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go


ALTER procedure [dbo].[Proc_UpdateCurrentOption]

@EngineStreamNO nvarchar(50),
@OnLine_Process nvarchar(20),
@OpMode nvarchar(20)

as

declare
@intErrorCode INT,
@intRowCount INT


BEGIN TRANSACTION

if (@OpMode = '1')
begin
if not exists (select 1 from dbo.OnLineOrder_CurrentTemp where OnLine_Process =@OnLine_Process)
begin
--print '1-I'
insert into dbo.OnLineOrder_CurrentTemp(EngineStreamNO, OnLine_Process, StartTime)
values (@EngineStreamNO, @OnLine_Process, getdate())

SELECT @intRowCount=@@ROWCOUNT,@intErrorCode=@@ERROR
IF @intErrorCode <> 0 OR @intRowCount != 1 GOTO ERROR1
end
else
begin
--print '1-U'
update dbo.OnLineOrder_CurrentTemp set EngineStreamNO =@EngineStreamNO,
StartTime=getdate()
where OnLine_Process =@OnLine_Process
IF @intErrorCode <> 0 OR @intRowCount != 1 GOTO ERROR1
select @intRowCount = 1
end
end


if (@OpMode = '2')
begin

select Top 1 @EngineStreamNO= EngineStreamNO from OnLineOrder_CurrentTemp where OnLine_Process =@OnLine_Process
if not exists (select 1 from dbo.OnLineOrder_CurrentTemp where OnLine_Process =@OnLine_Process)
begin
insert into dbo.OnLineOrder_CurrentTemp (EngineStreamNO, OnLine_Process, EndTime)
values (null, @OnLine_Process, getdate())
SELECT @intRowCount=@@ROWCOUNT,@intErrorCode=@@ERROR
IF @intErrorCode <> 0 OR @intRowCount != 1 GOTO ERROR1
end
else
begin
update dbo.OnLineOrder_CurrentTemp set EngineStreamNO =null , EndTime=getdate()
where OnLine_Process =@OnLine_Process
SELECT @intRowCount=@@ROWCOUNT,@intErrorCode=@@ERROR
IF @intErrorCode <> 0 OR @intRowCount != 1 GOTO ERROR1
end
end

COMMIT TRANSACTION

RETURN @intRowCount

ERROR1:
ROLLBACK TRANSACTION
RETURN -1