Crash on startup

[AlisterH]

Describe the bug
I often get a crash on startup:

(gdb) run
Starting program: /nix/store/xf4wzs6qy406i9xscly4yn7c6jkh5k6c-nasc-0.8.0/bin/com.github.parnold_x.nasc
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/nix/store/dbcw19dshdwnxdv5q2g6wldj6syyvq7l-glibc-2.39-52/lib/libthread_db.so.1".
process 27459 is executing new program: /nix/store/xf4wzs6qy406i9xscly4yn7c6jkh5k6c-nasc-0.8.0/bin/.com.github.parnold_x.nasc-wrapped
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/nix/store/dbcw19dshdwnxdv5q2g6wldj6syyvq7l-glibc-2.39-52/lib/libthread_db.so.1".
[INFO 04:53:56.618138] Application.vala:142: NaSC version: 0.8.0
[INFO 04:53:56.618168] Application.vala:145: Kernel version: 5.15.153.1-microsoft-standard-WSL2
[New Thread 0x7fffe99556c0 (LWP 27462)]
[New Thread 0x7fffe91546c0 (LWP 27463)]
[New Thread 0x7fffe89536c0 (LWP 27464)]
[New Thread 0x7fffdbfff6c0 (LWP 27465)]
[New Thread 0x7fffdb7fe6c0 (LWP 27466)]
[FATAL 04:53:56.798295] [Gdk] gdk_monitor_get_geometry: assertion 'GDK_IS_MONITOR (monitor)' failed
[FATAL 04:53:56.798325] [Gdk] gdk_monitor_get_scale_factor: assertion 'GDK_IS_MONITOR (monitor)' failed
Gdk-Message: 04:53:57.882: Unable to load sb_h_double_arrow from the cursor theme
[New Thread 0x7fffda9866c0 (LWP 27467)]
Gdk-Message: 04:53:58.061: Unable to load hand2 from the cursor theme
[New Thread 0x7fffda1856c0 (LWP 27468)]
[Detaching after vfork from child process 27469]
Gdk-Message: 04:53:58.102: Unable to load hand2 from the cursor theme
Gdk-Message: 04:53:58.108: Unable to load col-resize from the cursor theme
Gdk-Message: 04:53:58.108: Unable to load col-resize from the cursor theme
Gdk-Message: 04:53:58.111: Unable to load col-resize from the cursor theme
Gdk-Message: 04:53:58.111: Unable to load col-resize from the cursor theme
Gdk-Message: 04:53:58.134: Unable to load col-resize from the cursor theme
Gdk-Message: 04:53:58.134: Unable to load col-resize from the cursor theme
[FATAL 04:53:58.564652] update_thread_construct: assertion 'file != NULL' failed

Thread 1 "nasc" received signal SIGSEGV, Segmentation fault.
update_thread_ref (instance=0x0) at com.github.parnold_x.nasc.p/src/Calculator.c:3311
warning: 3311   com.github.parnold_x.nasc.p/src/Calculator.c: No such file or directory
(gdb) bt
#0  update_thread_ref (instance=0x0) at com.github.parnold_x.nasc.p/src/Calculator.c:3311
#1  0x00000000004b2d66 in __lambda7_ (self=0xba9960) at com.github.parnold_x.nasc.p/src/Calculator.c:3377
#2  0x00000000004b2e6b in ___lambda7__gsource_func (self=<optimized out>) at com.github.parnold_x.nasc.p/src/Calculator.c:3418
#3  0x00007ffff7da5c7a in g_timeout_dispatch () from /nix/store/8mg16qnlbdxlwcxva9p228fqmbc70i4p-glib-2.80.2/lib/libglib-2.0.so.0
#4  0x00007ffff7da1e39 in g_main_dispatch () from /nix/store/8mg16qnlbdxlwcxva9p228fqmbc70i4p-glib-2.80.2/lib/libglib-2.0.so.0
#5  0x00007ffff7da4fd7 in g_main_context_iterate_unlocked.isra () from /nix/store/8mg16qnlbdxlwcxva9p228fqmbc70i4p-glib-2.80.2/lib/libglib-2.0.so.0
#6  0x00007ffff7da55cc in g_main_context_iteration () from /nix/store/8mg16qnlbdxlwcxva9p228fqmbc70i4p-glib-2.80.2/lib/libglib-2.0.so.0
#7  0x00007ffff70f4d3d in g_application_run () from /nix/store/8mg16qnlbdxlwcxva9p228fqmbc70i4p-glib-2.80.2/lib/libgio-2.0.so.0
#8  0x00000000004c667c in nasc_nasc_app_main (args=0x7fffffffc7c8, args_length1=1) at com.github.parnold_x.nasc.p/src/Nasc.c:201
#9  0x00000000004c66a9 in main (argc=<optimized out>, argv=<optimized out>) at com.github.parnold_x.nasc.p/src/Nasc.c:209

Desktop (please complete the following information):

• OS: nixOS (running on windows 10 via WSL)
• Version: 24.05