Error?

I have written a couple of stored procedures.  The first one sets a date
and then passes it (via a call) into a second procedure that issues an SQL
statement to extract A/P information and insert it into a table.  They are
very simple procedures and execute with no errors when running them through
client access operations navigator.  However, when submitting them through
the 'green screen' using the call command, the following errors occur.

Message . . . . :   Pointer not set for location referenced.
Cause . . . . . :   A pointer was used, either directly or as a basing
  pointer, that has not been set to an address.

Even though this error occurs, the procedures still work and the output is
accurate.  Is this an error that I should be concerned about? Has anyone
else run into this, and how did you resolve the issue?

Thanks in advance for your help.