Hi -- please update your desktop version. 
this problem should have been fixed already. 
best holger
On Thu, Feb 13, 2020 at 17:23 +0100, Holger Uhle wrote:
  was working perfect yesterday. 
  name = 'deltachat_ffi'
 operating_system = 'unix:Ubuntu'
 crate_version = '1.0.0-beta.6'
 explanation = '''
 Panic occurred in file 'src/libcore/option.rs' at line 378
 '''
 method = 'Panic'
 backtrace = '''
 stack backtrace:
    0:     0x7fa76d9486c7 - <unknown>
    1:     0x7fa76d946b23 - backtrace::capture::Backtrace::new::hb0dd4020032a535d
    2:     0x7fa76db0c147 - <unknown>
    3:     0x7fa76d885c77 - human_panic::handle_dump::hb460e44955385d54
    4:     0x7fa76d01c1f9 - <unknown>
    5:     0x7fa76d96baf6 - std::panicking::rust_panic_with_hook::hf385e0a05e771036
    6:     0x7fa76d96b592 - <unknown>
    7:     0x7fa76d96b476 - rust_begin_unwind
    8:     0x7fa76d9941dd - core::panicking::panic_fmt::h581f7a1e5499d350
    9:     0x7fa76d99411c - core::panicking::panic::hf6893ada3b8c575b
   10:     0x7fa76d0a28ec - <unknown>
   11:     0x7fa76d09c54e - deltachat::imap::Imap::fetch::ha95b2dda1cbd8510
   12:     0x7fa76d19dfaf - deltachat::job::perform_imap_fetch::hb7716d1d6495a9c0
   13:     0x7fa76d01e28d - dc_perform_imap_fetch
   14:     0x7fa76d010860 - <unknown>
   15:     0x7fa783e8e6db - start_thread
   16:     0x7fa77df5188f - __clone
   17:                0x0 - <unknown>
 ''' 
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