Hmm! On Windows I'm able to export gifs normally, and as you said the web version is working fine... so it seems like there may be something more specific going on.
I'm curious about the error you got under Wine, if you're able to share that?
So, I made another test under wine and got the same results:
Unhandled exception: page fault on write access to 0x0000000000000000 in 64-bit code (0x000001400bb4c5). Register dump: rip:00000001400bb4c5 rsp:00007ffffe1f70c0 rbp:00007ffffe1f7161 eflags:00210247 ( R- -- I Z- -P-C) rax:0000000000000004 rbx:0000015600000200 rcx:00007ba90eab57b0 rdx:0000000000000000 rsi:00007ba90ea89600 rdi:0000000000000000 r8:000000000000002a r9:0000000000000000 r10:00007ba90da3c750 r11:00006fffffcc3b00 r12:0000000000000000 r13:0000000000000000 r14:0000000000000000 r15:0000000000000000 Stack dump: 0x007ffffe1f70c0: 00007ffffe1f7210 000000e600000008 0x007ffffe1f70d0: 000000e000000008 0000000000000000 0x007ffffe1f70e0: 0000000000000000 0000000000000000 0x007ffffe1f70f0: 0005591400000093 00007ba90de165b0 0x007ffffe1f7100: 00000000ffffffff 000000000002ac00 0x007ffffe1f7110: 0000015600000200 0000000000000200 0x007ffffe1f7120: 0000000000000000 00007ba90ea89600 0x007ffffe1f7130: 0000000000000005 00007ba90eab5870 0x007ffffe1f7140: 0000000000000000 0000000000000000 0x007ffffe1f7150: 0000000000000000 0000000000000000 0x007ffffe1f7160: 0000000000000000 0000015600000200 0x007ffffe1f7170: 0000000000000001 00007ba90eab5510 Backtrace: =>0 0x000001400bb4c5 in decker (+0xbb4c5) (0x007ffffe1f7161) 1 0x000001400877f3 in decker (+0x877f3) (0x00000000000001) 2 0x000001400870a5 in decker (+0x870a5) (0x007ffffe1f77c0) 3 0x00000140069ac7 in decker (+0x69ac7) (0x007ffffe1f77c0) 4 0x00000140070a6a in decker (+0x70a6a) (0x007ffffe1f78f0) 5 0x000001400a8d33 in decker (+0xa8d33) (0x007ffffe1fb970) 6 0x0000014000c368 in decker (+0xc368) (0x007ffffe1fcee0) 7 0x000001400bd4a2 in decker (+0xbd4a2) (0x007ffffeae0030) 8 0x000001400bc684 in decker (+0xbc684) (0x007ffffe1fffa0) 9 0x006fffffaa93d1 BaseThreadInitThunk+0x11(unknown=<internal error="">, entry=<internal error="">, arg=<internal error="">) [/usr/src/wine-9.0~repack-4build3/dlls/kernel32/thread.c:61] in kernel32 (0x007ffffe1fffa0) 10 0x006fffffca598b in ntdll (+0x5598b) (0000000000000000) 0x000001400bb4c5 decker+0xbb4c5: mov %dl, (%r14,%r12,1) Modules: Module Address Debug info Name (87 modules) PE 140000000- 1401a3000 Export decker ELF 5aad170ae000- 5aad170b3000 Deferred <wine-loader> PE-Wine 6ffffb0d0000- 6ffffb198000 Deferred uxtheme PE-Wine 6ffffb3a0000- 6ffffb3f9000 Deferred winex11 PE-Wine 6ffffb410000- 6ffffb48d000 Deferred imm32 PE-Wine 6ffffb810000- 6ffffbcda000 Deferred oleaut32 PE-Wine 6ffffbd60000- 6ffffbe80000 Deferred msctf PE-Wine 6ffffbe90000- 6ffffbead000 Deferred avrt PE-Wine 6ffffbec0000- 6ffffbede000 Deferred winepulse PE-Wine 6ffffbef0000- 6ffffbfe2000 Deferred mmdevapi PE-Wine 6ffffc000000- 6ffffc01a000 Deferred vcruntime140 PE 6ffffc030000- 6ffffc061000 Deferred sdl2_image PE-Wine 6ffffc080000- 6ffffc0fb000 Deferred msacm32 PE-Wine 6ffffc110000- 6ffffc2c5000 Deferred winmm PE-Wine 6ffffc2e0000- 6ffffc300000 Deferred version PE 6ffffc310000- 6ffffc540000 Deferred sdl2 PE-Wine 6ffffc550000- 6ffffc5a3000 Deferred shcore PE-Wine 6ffffc5c0000- 6ffffc6d7000 Deferred shlwapi PE-Wine 6ffffc6f0000- 6ffffd46b000 Deferred shell32 PE-Wine 6ffffd480000- 6ffffd4cd000 Deferred coml2 PE-Wine 6ffffd4e0000- 6ffffd51e000 Deferred win32u PE-Wine 6ffffd530000- 6ffffd55a000 Deferred zlib1 PE-Wine 6ffffd570000- 6ffffdb15000 Deferred user32 PE-Wine 6ffffdb70000- 6ffffdd45000 Deferred setupapi PE-Wine 6ffffdd60000- 6ffffe029000 Deferred gdi32 PE-Wine 6ffffe040000- 6ffffe1d5000 Deferred combase PE-Wine 6ffffe1f0000- 6ffffe479000 Deferred rpcrt4 PE-Wine 6ffffe490000- 6ffffea06000 Deferred ole32 PE-Wine 6ffffeae0000- 6ffffeed6000 Deferred ucrtbase PE-Wine 6ffffeef0000- 6ffffefad000 Deferred sechost PE-Wine 6ffffefc0000- 6fffff317000 Deferred msvcrt PE-Wine 6fffff330000- 6fffff45c000 Deferred advapi32 PE-Wine 6fffff470000- 6fffffa6c000 Deferred kernelbase PE-Wine 6fffffa80000- 6fffffc38000 Dwarf-4 kernel32 PE-Wine 6fffffc50000- 6ffffffeb000 Dwarf-4 ntdll ELF 7ba90ef56000- 7ba90ef7b000 Deferred libgpg-error.so.0 ELF 7ba90ef7b000- 7ba90f035000 Deferred libzstd.so.1 ELF 7ba90f035000- 7ba90f057000 Deferred liblz4.so.1 ELF 7ba90f057000- 7ba90f19f000 Deferred libgcrypt.so.20 ELF 7ba90f19f000- 7ba90f1ac000 Deferred libcap.so.2 ELF 7ba90f1ac000- 7ba90f222000 Deferred libmp3lame.so.0 ELF 7ba90f222000- 7ba90f27e000 Deferred libmpg123.so.0 ELF 7ba90f27e000- 7ba90f2dd000 Deferred libopus.so.0 ELF 7ba90f2dd000- 7ba90f388000 Deferred libvorbisenc.so.2 ELF 7ba90f388000- 7ba90f3b6000 Deferred libvorbis.so.0 ELF 7ba90f3b6000- 7ba90f41a000 Deferred libflac.so.12 ELF 7ba90f41a000- 7ba90f4fa000 Deferred libsystemd.so.0 ELF 7ba90f4fa000- 7ba90f582000 Deferred libsndfile.so.1 ELF 7ba90f582000- 7ba90f600000 Deferred libpulsecommon-16.1.so ELF 7ba90f93d000- 7ba90f947000 Deferred libogg.so.0 ELF 7ba90f947000- 7ba90f95b000 Deferred libapparmor.so.1 ELF 7ba90f95b000- 7ba90f963000 Deferred libasyncns.so.0 ELF 7ba90f963000- 7ba90f9b2000 Deferred libdbus-1.so.3 ELF 7ba90f9b2000- 7ba90fa03000 Deferred libpulse.so.0 ELF 7ba90fa44000- 7ba90fa4c000 Deferred libxfixes.so.3 ELF 7ba90fa4c000- 7ba90fa58000 Deferred libxcursor.so.1 ELF 7ba90fa58000- 7ba90fa6b000 Deferred libxi.so.6 ELF 7ba90fa6b000- 7ba90fa70000 Deferred libxcomposite.so.1 ELF 7ba90fa70000- 7ba90fa7d000 Deferred libxrandr.so.2 ELF 7ba90fa7d000- 7ba90fa89000 Deferred libxrender.so.1 ELF 7ba90fa89000- 7ba90fa90000 Deferred libxxf86vm.so.1 ELF 7ba90fa90000- 7ba90fa95000 Deferred libxinerama.so.1 ELF 7ba90fa95000- 7ba90faa4000 Deferred libmd.so.0 ELF 7ba90faa4000- 7ba90faba000 Deferred libbsd.so.0 ELF 7ba90faba000- 7ba90fac2000 Deferred libxdmcp.so.6 ELF 7ba90fac2000- 7ba90fac8000 Deferred libxau.so.6 ELF 7ba90fac8000- 7ba90faf1000 Deferred libxcb.so.1 ELF 7ba90faf1000- 7ba90fc2e000 Deferred libx11.so.6 ELF 7ba90fc2e000- 7ba90fc42000 Deferred libxext.so.6 ELF 7ba90fc43000- 7ba90fc48000 Deferred libx11-xcb.so.1 ELF 7ba90fc48000- 7ba90fc5d000 Deferred winepulse.so ELF 7ba90fc5f000- 7ba90fce5000 Deferred winex11.so ELF 7ba91005b000- 7ba9100ac000 Deferred libfontconfig.so.1 ELF 7ba9100ac000- 7ba910178000 Deferred libfreetype.so.6 ELF 7ba910178000- 7ba910261000 Deferred libm.so.6 ELF 7ba910261000- 7ba910400000 Deferred win32u.so ELF 7ba910d79000- 7ba910da5000 Deferred libexpat.so.1 ELF 7ba910da5000- 7ba910dc8000 Deferred libbrotlicommon.so.1 ELF 7ba910dc8000- 7ba910e00000 Deferred libpng16.so.16 ELF 7ba910e00000- 7ba911012000 Deferred libc.so.6 ELF 7ba911021000- 7ba91102f000 Deferred libbrotlidec.so.1 ELF 7ba91102f000- 7ba911043000 Deferred libbz2.so.1.0 ELF 7ba911043000- 7ba91105f000 Deferred libz.so.1 ELF 7ba91105f000- 7ba911091000 Deferred liblzma.so.5 ELF 7ba911091000- 7ba9110ac000 Deferred libunwind.so.8 ELF 7ba9110ac000- 7ba911167000 Export ntdll.so ELF 7ba911191000- 7ba9111cb000 Deferred ld-linux-x86-64.so.2 Threads: process tid prio name (all IDs are in hex) 00000020 start.exe 00000024 0 00000038 services.exe 0000003c 0 00000040 0 wine_rpcrt4_server 0000004c 0 wine_rpcrt4_io 00000070 0 wine_rpcrt4_io 0000009c 0 wine_rpcrt4_io 000000b4 0 wine_rpcrt4_io 000000c8 0 000000e0 0 wine_rpcrt4_io 00000044 winedevice.exe 00000048 0 00000054 0 00000058 0 wine_sechost_service 0000005c 0 00000060 0 00000064 0 000000c0 0 000000c4 0 00000068 winedevice.exe 0000006c 0 00000074 0 00000078 0 wine_sechost_service 0000007c 0 00000080 0 00000084 0 00000090 0 00000088 plugplay.exe 0000008c 0 000000a0 0 000000a4 0 wine_sechost_service 000000a8 0 wine_rpcrt4_server 00000094 explorer.exe 00000098 0 000000cc 0 000000d0 0 wine_rpcrt4_server 000000ac svchost.exe 000000b0 0 000000b8 0 000000bc 0 wine_sechost_service 000000d8 rpcss.exe 000000dc 0 000000e8 0 000000ec 0 wine_sechost_service 000000f0 0 wine_rpcrt4_server 000000f4 0 wine_rpcrt4_server 000000f8 0 wine_rpcrt4_io 00000100 (D) Z:\home\pedro\\C1rea de Trabalho\Decker\decker.exe 00000104 0 <== 00000108 0 SDLTimer 0000010c 0 wine_mmdevapi_notification 00000110 15 audio_client_main 00000114 15 audio_client_timer 00000118 15 SDLAudioP1 0000012c 0 00000124 conhost.exe 00000128 0 System information: Wine build: wine-9.0 (Ubuntu 9.0~repack-4build3) Platform: x86_64 (guest: i386) Version: Windows 10 Host system: Linux Host version: 6.17.0-14-generic</wine-loader></internal></internal></internal>