Error Code 7 A malloc() failed

[Fim]

In my system, I handle all processing of a Sql database via a special IO module, a module for each table. Everything works as I had imagined. But in a special case I get error code 7. I have done some tests and it seems I do NOT get error if I make all SQL calls directly in a program without going through an io module.
I get the error after 3732 calls with function GU (get unique).

Code Select Expand

FUNKTION_GU:
'===========
'
GU_SELECT:
    slOpen TRIM$(KOM.DATABAS)
    SET_NUMMER = slGetUnusedSetNumber
    SEL_STRANG = "SELECT * FROM ART WHERE ARTNR= " + $SQ + TRIM$(ART.ARTNR) + $SQ
    SVAR = slSel(SEL_STRANG, SET_NUMMER) ' Ska ge noll
    IF SVAR <>  0 THEN
        KOM.FELTEXT = "SYSTEMFEL i ARTIO GU slSel=" + STR$(SVAR)  <<============
        GOTO SYSTEMFELHANTERING
        EXIT SUB
    END IF
Tips where to look for errors are gratefully received.
/Fim W.

[Fim]

After a few changes to my program, everything works as it should. Which of the changes that corrected the error I do not know.

[Fim]

cj,
Thanks for that information
/Fim W.

[Fim]

There is something wrong with this forum. Wise answers disappear. Recently, there was an answer that meant that a row would be added to one of the SQLitening programs. That answer has disappeared. What is going on?
/Fim W.