Crash when getting key-value pairs during iteration

[vmosone]

OS: windows 8.1
Rust toolchain: nightly-1.29.0-x86_64-pc-windows-gnu
Clang:
clang version 5.0.0 (tags/RELEASE_500/final)
Target: x86_64-w64-windows-gnu
Thread model: posix
unqlite.rs: 1.4.1

gdb trace info:
...
warning: HEAP[test_db.exe]:
warning: Invalid address specified to RtlFreeHeap( 0000000000AC0000, 0000000000024830 )
Program received signal SIGTRAP, Trace/breakpoint trap.
0x00007ff8b7413af2 in ntdll!RtlpNtMakeTemporaryKey ()
from C:\WINDOWS\SYSTEM32\ntdll.dll
(gdb) bt
bt
#0 0x00007ff8b7413af2 in ntdll!RtlpNtMakeTemporaryKey ()
from C:\WINDOWS\SYSTEM32\ntdll.dll
#1 0x00007ff8b73cd876 in ntdll!memset () from C:\WINDOWS\SYSTEM32\ntdll.dll
#2 0x00007ff8b7412984 in ntdll!RtlpNtMakeTemporaryKey ()
from C:\WINDOWS\SYSTEM32\ntdll.dll
#3 0x00007ff8b73ca8d5 in ntdll!memset () from C:\WINDOWS\SYSTEM32\ntdll.dll
#4 0x00007ff8b7355a38 in ntdll!RtlFreeHeap ()
from C:\WINDOWS\SYSTEM32\ntdll.dll
#5 0x0000000000419282 in alloc::alloc::dealloc (
ptr=0x24830 "SALDKFJ;098787t5k,.mcv,xmc.ckpo&^%IOU_)K<jlknksafd;alkmds7t6r57k()&^%$#@$%^&<mhlsmv,s.mdf;lasdfya967sdjl;867546KHHGLK;", '\253' <repeats 16 times>, "\356\376\356\376\356\376\000", layout=...)
at C:\projects\rust\src\liballoc/alloc.rs:80
#6 0x000000000041906b in <alloc::alloc::Global as core::alloc::Alloc>::dealloc (self=0x23fb60, ptr=..., layout=...)
at C:\projects\rust\src\liballoc/alloc.rs:128
#7 0x000000000041ad3a in <alloc::raw_vec::RawVec<T, A>>::dealloc_buffer (
self=0x23fb60) at C:\projects\rust\src\liballoc/raw_vec.rs:720
#8 0x000000000041c813 in <alloc::raw_vec::RawVec<T, A> as core::ops::drop::Drop>::drop (self=0x23fb60) at C:\projects\rust\src\liballoc/raw_vec.rs:729
#9 0x0000000000403ab3 in core::ptr::drop_in_place ()
at C:\projects\rust\src\libcore/ptr.rs:59
#10 0x0000000000403b02 in core::ptr::drop_in_place ()
at C:\projects\rust\src\libcore/ptr.rs:59
#11 0x0000000000406a16 in test_db::main () at src\main.rs:38
(gdb)

#0  0x00007ff8b7413af2 in ntdll!RtlpNtMakeTemporaryKey ()
   from C:\WINDOWS\SYSTEM32\ntdll.dll
#1  0x00007ff8b73cd876 in ntdll!memset () from C:\WINDOWS\SYSTEM32\ntdll.dll
#2  0x00007ff8b7412984 in ntdll!RtlpNtMakeTemporaryKey () from C:\WINDOWS\SYSTEM32\ntdll.dll
#3  0x00007ff8b73ca8d5 in ntdll!memset () from C:\WINDOWS\SYSTEM32\ntdll.dll
#4  0x00007ff8b7355a38 in ntdll!RtlFreeHeap ()
   from C:\WINDOWS\SYSTEM32\ntdll.dll
#5  0x0000000000419282 in alloc::alloc::dealloc (
    ptr=0x24830 "SALDKFJ;098787t5k,.mcv,xmc.ckpo&*^%*IOU_)K<jlknksafd;alkmds7t6r57k()*&^%$#@$%^&*<mhlsmv,s.mdf;lasdfya967sdjl;867546KHHGLK;", '\253' <repeats 16 times>, "\356\376\356\376\356\376\000", layout=...)
    at C:\projects\rust\src\liballoc/alloc.rs:80
#6  0x000000000041906b in <alloc::alloc::Global as core::alloc::Alloc>::dealloc (self=0x23fb60, ptr=..., layout=...)
    at C:\projects\rust\src\liballoc/alloc.rs:128
#7  0x000000000041ad3a in <alloc::raw_vec::RawVec<T, A>>::dealloc_buffer (self=0x23fb60) at C:\projects\rust\src\liballoc/raw_vec.rs:720
#8  0x000000000041c813 in <alloc::raw_vec::RawVec<T, A> as core::ops::drop::Drop>::drop (self=0x23fb60) at C:\projects\rust\src\liballoc/raw_vec.rs:729
#9  0x0000000000403ab3 in core::ptr::drop_in_place ()
    at C:\projects\rust\src\libcore/ptr.rs:59
#10 0x0000000000403b02 in core::ptr::drop_in_place ()
    at C:\projects\rust\src\libcore/ptr.rs:59
#11 0x0000000000406a16 in test_db::main () at src\main.rs:38