Does anyone have a clue why very infrequently I might be getting the following error while running a VFP.exe?

STFUFF.exe caused an exception 10H in module VFP500.DLL at 0137:100657b7.Registers:
EAX=00000001 CS=0137 EIP=100657b7 EFLGS=00010246
EBX=0063a5f4 SS=013f ESP=0063a0ec EBP=0063a654
ECX=00000000 DS=013f ESI=01945fb8 FS=1347
EDX=0063a0c4 ES=013f EDI=00000001 GS=0000Bytes at CS:EIP:
dc 4d bc e8 3c 38 fa ff 6a 00 8d 4d fc 51 8d 55 Stack dump:
01946154 01945fb8 00000000 00000000 00000003 00000006 00000000 00000000
00000006 019c23b0 10024ab4 00000000 102ff52c 1002dd95 31202020 00003933