Steps to reproduce:
1. Create new XLSX (not odt);
2. Insert new sheet;
3. Save the file.

Editor hangs on. Crash in logs:
kit-00374-00375 2019-03-01 13:00:08.168831 [ lo_startmain ] SIG   Fatal signal received: SIGABRT
Backtrace 374:
/online/loolforkit(_ZN7SigUtil13dumpBacktraceEv+0x5f) [0x4b46af]
/online/loolforkit() [0x4b57f0]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390) [0x7f15ca92c390]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x38) [0x7f15ca586428]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x16a) [0x7f15ca58802a]
/core/instdir/program/libvcllo.so(_ZN16SalUserEventList18DispatchUserEventsEb+0x42c) [0x7f15c370c4cc]
/core/instdir/program/libvcllo.so(_ZN14SvpSalInstance7DoYieldEbb+0x38) [0x7f15c37ad948]
/core/instdir/program/libvcllo.so(_ZN11Application5YieldEv+0x2e) [0x7f15c371cebe]
/core/instdir/program/libvcllo.so(_ZN11Application7ExecuteEv+0x45) [0x7f15c371e755]
/core/instdir/program/libsofficeapp.so(+0x28988) [0x7f15c9592988]
/core/instdir/program/libvcllo.so(+0x525d06) [0x7f15c3723d06]
/core/instdir/program/libvcllo.so(_Z6SVMainv+0x22) [0x7f15c3723e02]
/core/instdir/program/libsofficeapp.so(soffice_main+0x8a) [0x7f15c95bd54a]
/core/instdir/program/libsofficeapp.so(+0x64c51) [0x7f15c95cec51]
/core/instdir/program/libuno_sal.so.3(+0x3f327) [0x7f15c76ee327]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba) [0x7f15ca9226ba]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7f15ca65841d]


When creating Try it on 6.2, also latest Colabora stable version - same results.