ms access fix textbox #Erro

I had this question after viewing Import XML File Into Access Table Using VBA???.
Hi everyone,
I need help,
  I have one textbox and I use one function  =Nz(DSum("[Total]","Total_Customer_Qarz","[Customer_ID] = " & [Customer_ID]),0)
so when having records it's showing me correct but when have no record will give to me #ERROR!
adamdaban dabanStudentAsked:
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crystal (strive4peace) - Microsoft MVP, AccessRemote Training and ProgrammingCommented:
when there is no record,  [Customer_ID] will not have a value --> substitute nz([Customer_ID],-99) where -99 is some value you do not have in your table

I see you do have NZ wrapped around the whole thing ... but that is not helping when there is no value in the control
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adamdaban dabanStudentAuthor Commented:
sorry I'm not understanding your solution
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crystal (strive4peace) - Microsoft MVP, AccessRemote Training and ProgrammingCommented:
try:

=DSum("[Total]","Total_Customer_Qarz", "[Customer_ID] = " & NZ([Customer_ID],0) )

I simply moved the NZ function

NZ is Null-to-Zero and returns 0, "", or whatever is in the optional second argument if the first argument does not have a value
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adamdaban dabanStudentAuthor Commented:
Thanks it's work
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crystal (strive4peace) - Microsoft MVP, AccessRemote Training and ProgrammingCommented:
you're welcome ~ happy to help
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