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Weird BASIC problem

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I have a weird problem. A routine which is called successfully hundreds of 
times, always from the same place in the code, fails when one of the 
passed parameters is not defined. However a call to *reporrtstack from 
within the failing routine shows that the variable is being passed in.

My initial reaction was to increase the wimp slot, because this occurs 
when a variable in increased, so I have a pretty strong suspicion that 
memory is being corrupted somewhere. I don't know where to look though. 
What can undefine a variable in this way?

The called function:

DEF PROCFD_SET(n%,p%)
  IF DEBUG%AND1 THEN
    *report SL: fd_set: n% p% (n% DIV 32) (n% MOD 32)
    *REPORTSTACK
  ENDIF
  p%!((n% DIV 32)*4) = p%!((n% DIV 32)*4) OR (1<<(n% MOD 32))
ENDPROC

The reporter result

SL: fd_set: n%=14 p% (n% DIV 32)=0 (n% MOD 32)=14
BASIC Stack
   315 REPEAT
   326 PROCreturn13(&00074AC0)
   813 PROCnull(&00074AC0)
   582 PROCcheckincoming
   737 FOR Integer=0 [TO 28 STEP 1]
   794 PROCdespatch(0)
  1081 WHILE dataend%(client%*2)<>datastart%(client%*2)
  1137 PROCsavegates_exec(0)
  3122 PROCsendmessage("",0)
  3886 PROCsendbuffer(1)
   661 PROCFD_SET(14,&00092390) [in "Libraries.Slalom_Comms_Lib"]
11:23:43.17 ** BASICError ** ERR=4 Mistake ERL=435 [in 
"Libraries.SocketLib"]
Memory: Prog=153,797 Vars=973,436 Free=146,820 Stack=56 Undefined=0 
Slot=1248K


-- 
Alan Adams, from Northamptonshire
alan@adamshome.org.uk
http://www.nckc.org.uk/

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Weird BASIC problem Alan Adams <alan@adamshome.org.uk> - 2020-07-30 11:32 +0100
  Re: Weird BASIC problem Alan Adams <alan@adamshome.org.uk> - 2020-07-30 13:54 +0100
    Weird BASIC problem Martin <News03@avisoft.f9.co.uk> - 2020-07-31 12:39 +0100

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