company-mode, Search failed: "\<\w+"" with args (prefix)

[duianto]

When company-mode is enabled.
Typing a semicolon in an empty ahk-mode buffer shows:

Company: An error occurred in auto-begin
Company: backend company-capf error "Search failed: "<\w+"" with args (prefix)

Reproduction steps

With these two packages installed:
ahk-mode
company-mode (https://github.com/company-mode/company-mode)

• Open a new buffer: C-x b test RET
• Enable the two packages:
• M-x ahk-mode RET
• M-x company-mode RET
• Type a semicolon: ;
  the following lines appear in the messages buffer (C-h e):

Company: An error occurred in auto-begin
Company: backend company-capf error "Search failed: "\<\w+"" with args (prefix)

• Enable debug-on-error from the Eval prompt:
  S-M-; (setq debug-on-error t) RET

• Erase the semicolon: <backspace>

• Type a semicolon: ;
  A *Backtrace* buffer opens:

Debugger entered--Lisp error: (search-failed "\<\w+")
re-search-backward("\<\w+")
ahk-completion-at-point()
completion--capf-wrapper(ahk-completion-at-point optimist)
run-hook-wrapped(completion--capf-wrapper ahk-completion-at-point optimist)
company--capf-data-real()
company--capf-data()
company-capf(prefix)
apply(company-capf prefix)
company-call-backend-raw(prefix)
apply(company-call-backend-raw prefix)
company--force-sync(company-call-backend-raw (prefix) company-capf)
company-call-backend(prefix)
company--begin-new()
company--perform()
company-auto-begin()
company-idle-begin(# #<window 3 on test> 8 2)
apply(company-idle-begin (# #<window 3 on test> 8 2))
timer-event-handler([t 24650 31286 705585 nil company-idle-begin (# #<window 3 on test> 8 2) nil 0])

System info

ahk-mode version 1.5.6
Company version: 0.9.13
GNU Emacs 27.1 (build 1, x86_64-w64-mingw32) of 2020-08-21
Windows 10 Version 2004