I can get it to 100% repro when i have a string type (struct string { const char *Characters; i32 Length; }) in the watch, then modify the expression
StringVariable.slice()
into
StringVariable.()
by deleting the word slice with the backspace.

[Window Title]
Fatal Exception

[Content]
A fatal exception (code 0xc0000005) occurred. The process is terminating.

Call stack:

1. [0x7ff6cf954ea1] e_expr_push_child +513, eval_parse.c line 320
2. [0x7ff6cf9630e4] e_push_irtree_and_type_from_expr +14036, eval_ir.c line 1362
3. [0x7ff6cf944811] e_irtree_from_bundle +273, eval_core.c line 850
4. [0x7ff6cf9450db] e_eval_from_bundle +155, eval_core.c line 961
5. [0x7ff6cfa8ed38] e_type_expand_range__watches +408, raddbg_eval.c line 1206
6. [0x7ff6cf96fd7d] ev_windowed_row_list_from_block_range_list +1245, eval_visualization_core.c line 989
7. [0x7ff6cf970282] ev_row_from_num +146, eval_visualization_core.c line 1031
8. [0x7ff6cfabe90a] rd_tbl_from_watch_pt +186, raddbg_views.c line 902
9. [0x7ff6cf9eca75] rd_view_ui +25029, raddbg_core.c line 3114
10. [0x7ff6cfa30c4e] rd_window_frame +143550, raddbg_core.c line 8697
11. [0x7ff6cfa86568] rd_frame +272792, raddbg_core.c line 16374
12. [0x7ff6cf8dc4e9] frame +9, raddbg_main.c line 719
13. [0x7ff6cf8d5799] update +25, base_entry_point.c line 128
14. [0x7ff6cf8da8e1] entry_point +6801, raddbg_main.c line 970
15. [0x7ff6cf8d5724] main_thread_base_entry_point +340, base_entry_point.c line 100
16. [0x7ff6cfad9c12] w32_entry_point_caller +2802, os_core_win32.c line 1771
17. [0x7ff6cf8df7d6] wWinMain +54, os_core_win32.c line 1783
18. [0x7ff6cfb1698e] __scrt_common_main_seh +262, exe_common.inl line 288
19. [0x7ff85e647374] KERNEL32
20. [0x7ff85efbcc91] ntdll

Version: 0.9.16 [7048a87]