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VBA replace function gives "Invalid use of null" error

The following text field is loaded into a variable.
When I use the replace function to fix the apostrophe in the string I get the null error above
The apostrophe needs to be set to '' so I can use it to insert into another table.

This replace method has worked on other text field types.

Text data in variable p_sibio

Mark has 30 years' experience in quality management and organizational improvement. He is VP of Quality Systems Division at Orchard Material Technology. OMT focuses on innovations in energy, the environment and material sciences. Prior to OMT, He was President at Harold Communications . President at the National Council of Performance Excellence and COO at TUO America. He's a board member of the Society of Organizational Learning, the VT Council for Quality and MassExcellence. He was a National Malcolm Baldrige Examiner and is a Senior Member of ASQ. Mark has a BS in Industrial Engineering and a Masters in Management Science.

p_s1bio = Replace(p_s1bio, "'", "''")

Error: invalid use of null pointing to the replace statement

Any suggestions to resolve this error or is there something else in the data string I am not seeing?
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TOWELLR
Asked:
TOWELLR
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2 Solutions
 
Rey Obrero (Capricorn1)Commented:
try

p_s1bio = Replace(p_s1bio & Chr(39), Chr(39), "''")
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mbizupCommented:
Or this if you simply want to leave nulls blank:

 p_s1bio = Replace(NZ(p_s1bio, "") , "'", "''")

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TOWELLRAuthor Commented:
capricorn1

Your suggestion cleared the null error but left a trailing quote

mbizup

Your suggestion works fine.
I guess I had some null value in the string that I could not observe.

Thanks to both for the insight.
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mbizupCommented:
<< I guess I had some null value in the string that I could not observe. >>

You wouldn't have portions of a field or string being null.  It can only be Null or not null (not anything in between).  Just hazarding a guess that this function was operating on different records in some table, and that in some records, that field is completely blank (ie: Null - absence of value).

Are you a Hokie?  Either way, glad to help with something seemingly related to my alma mater :-)
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TOWELLRAuthor Commented:
You know what you are correct.  I got so fixated to resolve the quote issue and thought the null error was on the same record.  I was thinking the replace function was just misbehaving in some way.  It was actually from the next record in the table that had no p_sibio value.

I better institute some better error handling.

Thanks
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