Error Message:Exception number: c0000005

i'm using vb6 to connect to postgres database in the server and everytime when i close a particular form this error msg will come out, anyone have any ideas please help.. thanks!!

below are part of the error log file:-
Application exception occurred:
App: VB6.exe (pid=3980)
When: 07/01/03 @ 12:04:40.472
Exception number: c0000005 (access violation)
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State Dump for Thread Id 0xf88

eax=00002340 ebx=0b160000 ecx=00000000 edx=0de2f850 esi=0de2d508 edi=0de2f848
eip=77fca723 esp=0012f150 ebp=0012f15c iopl=0 nv up ei ng nz na po cy
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000287

function: RtlFreeHeap
77fca70c 56 push esi
77fca70d 57 push edi
77fca70e 8b7d0c mov edi,[ebp+0xc] ss:00c0c732=????????
77fca711 8b5d08 mov ebx,[ebp+0x8] ss:00c0c732=????????
77fca714 8bf7 mov esi,edi
77fca716 0fb74702 movzx eax,word ptr [edi+0x2] ds:0e90ce1f=????
77fca71a c1e003 shl eax,0x3
77fca71d 2bf0 sub esi,eax
77fca71f 3bf7 cmp esi,edi
77fca721 740a jz 77fd9d2d
FAULT ->77fca723 f6460501 test byte ptr [esi+0x5],0x1 ds:0e90aade=??
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*----> Stack Back Trace <----*

FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name
0012F15C 77FCA635 0B160000 0DE2F848 0012F1D4 00000000 ntdll!RtlFreeHeap