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534e20cf3a
It fixes the following crash:
```nasm
[----------------------------------registers-----------------------------------]
RAX: 0xffffffffffffffe4
RBX: 0x7fffffffbd88 --> 0x0
RCX: 0x555555861f01 --> 0xd6000055555582fa
RDX: 0x1
RSI: 0x0
RDI: 0xff
RBP: 0x2e94
RSP: 0x7fffffff9bb0 --> 0x0
RIP: 0x55555574e286 (<_ZN4ESM44Cell4loadERNS_6ReaderE+182>: mov eax,DWORD PTR [rax+0xc])
R8 : 0x0
R9 : 0x555555836bd0 --> 0x555555861f90 --> 0x100000000000000
R10: 0xffffffff
R11: 0x0
R12: 0x7fffffffbd88 --> 0x0
R13: 0x7fffffffbd30 --> 0x7fffffffbd28 --> 0xff0001
R14: 0x7fffffff9da0 --> 0x10fc
R15: 0x7fffffff9ea8 --> 0x7fffffff9eb8 --> 0x0
EFLAGS: 0x10206 (carry PARITY adjust zero sign trap INTERRUPT direction overflow)
[-------------------------------------code-------------------------------------]
0x55555574e27c <_ZN4ESM44Cell4loadERNS_6ReaderE+172>: mov rdi,r12
0x55555574e27f <_ZN4ESM44Cell4loadERNS_6ReaderE+175>: xor esi,esi
0x55555574e281 <_ZN4ESM44Cell4loadERNS_6ReaderE+177>: call 0x5555557edfb0 <_ZNK4ESM46Reader3grpEm>
=> 0x55555574e286 <_ZN4ESM44Cell4loadERNS_6ReaderE+182>: mov eax,DWORD PTR [rax+0xc]
0x55555574e289 <_ZN4ESM44Cell4loadERNS_6ReaderE+185>: cmp eax,0xff
0x55555574e28e <_ZN4ESM44Cell4loadERNS_6ReaderE+190>: ja 0x55555574e314 <_ZN4ESM44Cell4loadERNS_6ReaderE+324>
0x55555574e294 <_ZN4ESM44Cell4loadERNS_6ReaderE+196>: cmp al,0x5
0x55555574e296 <_ZN4ESM44Cell4loadERNS_6ReaderE+198>: jne 0x55555574e314 <_ZN4ESM44Cell4loadERNS_6ReaderE+324>
[------------------------------------stack-------------------------------------]
0000| 0x7fffffff9bb0 --> 0x0
0008| 0x7fffffff9bb8 --> 0x0
0016| 0x7fffffff9bc0 --> 0x0
0024| 0x7fffffff9bc8 --> 0x0
0032| 0x7fffffff9bd0 --> 0x0
0040| 0x7fffffff9bd8 --> 0x0
0048| 0x7fffffff9be0 --> 0x0
0056| 0x7fffffff9be8 --> 0x0
[------------------------------------------------------------------------------]
Legend: code, data, rodata, value
Stopped reason: SIGSEGV
0x000055555574e286 in ESM4::Cell::load (this=0x7fffffff9da0, reader=...) at /home/jvoisin/dev/openmw/openmw/components/esm4/loadcell.cpp:68
68 if (reader.grp().type == ESM4::Grp_ExteriorSubCell && reader.grp().label.grid[1] == 0
gdb-peda$ bt
this=<optimized out>, reader=...) at /home/jvoisin/dev/openmw/openmw/apps/esmtool/tes4.cpp:547
recordInvocable=...) at /home/jvoisin/dev/openmw/openmw/./components/esm4/readerutils.hpp:31
at /home/jvoisin/dev/openmw/openmw/./components/esm4/readerutils.hpp:23
at ../csu/libc-start.c:381
```
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|---|---|---|
| .. | ||
| bsa | ||
| bullethelpers | ||
| compiler | ||
| config | ||
| contentselector | ||
| crashcatcher | ||
| debug | ||
| detournavigator | ||
| esm | ||
| esm3 | ||
| esm3terrain | ||
| esm4 | ||
| esmloader | ||
| fallback | ||
| files | ||
| fontloader | ||
| fx | ||
| interpreter | ||
| l10n | ||
| loadinglistener | ||
| lua | ||
| lua_ui | ||
| misc | ||
| myguiplatform | ||
| navmeshtool | ||
| nif | ||
| nifbullet | ||
| nifosg | ||
| platform | ||
| process | ||
| resource | ||
| sceneutil | ||
| sdlutil | ||
| serialization | ||
| settings | ||
| shader | ||
| sqlite3 | ||
| std140 | ||
| stereo | ||
| terrain | ||
| to_utf8 | ||
| translation | ||
| version | ||
| vfs | ||
| widgets | ||
| CMakeLists.txt | ||
| doc.hpp | ||
| windows.hpp | ||