Mailspring: Bug: Fatal error when syncing IMAP

[BrunoSpy]

Describe the bug
Mailsync can't finish sync of IMAP account : stuck at 1%.

To Reproduce
21470 [2020-09-08 14:45:04.291] [main] [info] ------------- Starting Sync (**) ---------------
21470 [2020-09-08 14:45:04.300] [metadata] [info] Metadata delta stream starting...
21470 [2020-09-08 14:45:08.300] [background] [info] Marking all folders as busy
21470 [2020-09-08 14:45:08.310] [background] [info] Syncing folder list...
21470 [2020-09-08 14:45:08.817] [background] [info] Syncing folder list...
21470 [2020-09-08 14:45:08.928] [background] [info] syncFolderUIDRange for INBOX, UIDs: 1 - 109986, Heavy: false
21470 [2020-09-08 14:45:09.171] [background] [info] - remote=4500, local=0
21470 [2020-09-08 14:45:09.237] [background] [info] - Fetching full headers for 4500 (of 4500 needed)
21470 [2020-09-08 14:45:09.278] [foreground] [info] syncFolderUIDRange for INBOX, UIDs: 110591 - 110740, Heavy: false
21470 [2020-09-08 14:45:09.390] [foreground] [info] - remote=101, local=101
21470 [2020-09-08 14:45:09.403] [foreground] [info] Idling on folder INBOX
21470 [2020-09-08 14:45:09.434] [background] [critical]

---

* Mailspring Sync
An exception occurred during program execution:
** {"debuginfo":"syncFolderUIDRange - fetchMessagesByUID (heavy)","key":"ErrorFetch","retryable":true,"what":"std::exception"}

---

21470 [2020-09-08 14:45:09.435] [background] [critical] * Stack trace (line numbers are approximate):
??:? SyncWorker::syncFolderUIDRange(Folder&, mailcore::Range, bool, vector)
* ??:? SyncWorker::syncNow()
??:? runBackgroundSyncWorker()
main.cpp:? main::{lambda()#3}::operator()() const
main.cpp:? _Bind_simple::operator()()
main.cpp:? thread::_Impl::_M_run()
* thread.o:? execute_native_thread_routine()

Setup: (please complete the following information):

• OS: Arch Linux
• Mailspring Version: latest 1.7.8

Additional context
Tried to fully delete Mailspring and reinstall, clear et reconstruct cache... doesn't help : same error over and over.

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