Bug 125524

Description:
Whilst editing Cell D25, mis-typing the following formula [=SUMIFS($'weekly data'.i5$'weekly data'.i$'weekly data'.m5$'Weekly Data'.M5:M5000,$'Weekly Data'.E7:E5000,A25,$'Weekly Data'.F7:F44,B25,$'Weekly Data'.G7:G43,C25)], hitting [ENTER], it produced an (expected) error.
I then removed the initial [$'weekly data'.i5$'weekly data'.i$'weekly data'.m5], hit [ENTER] (also tried the formula TICK) and Libre Calc crashed (disappears, no error messages).

Steps to Reproduce:
1. Enter bad formula [=SUMIFS($'weekly data'.i5$'weekly data'.i$'weekly data'.m5$'Weekly Data'.M5:M5000,$'Weekly Data'.E7:E5000,A25,$'Weekly Data'.F7:F44,B25,$'Weekly Data'.G7:G43,C25)]
2. Hit [ENTER]
3. Attempt to remove first part of formula [$'weekly data'.i5$'weekly data'.i$'weekly data'.m5].
4. <CRASH>

Actual Results:
LibreCalc produces no error messages, disappears from the screen, requiring user to re-launch LibreCalc.
Repeating this exact formula in a different cell, results in the same issue.

Expected Results:
Adjusted formula, without crashing.


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
Version: 6.2.4.2.0+
Build ID: 6.2.4-1
CPU threads: 4; OS: Linux 5.1; UI render: default; VCL: kde5; 
Locale: en-GB (en_GB.UTF-8); UI-Language: en-GB
Calc: threaded

OpenGL renderer string: Mesa DRI Intel(R) Haswell Desktop 
OpenGL core profile version string: 4.5 (Core Profile) Mesa 19.0.5
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 19.0.5
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.1 Mesa 19.0.5
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10
OpenGL ES profile extensions: