Error when visiting a subfolder without files

[AlonTzarafi]

When visiting a subfolder without files, there is an error thrown by line 223 of the code:
(minspc (1+ (apply #'max (dgi--get-dired-files-length files))))

The backtrace:

Debugger entered--Lisp error: (wrong-number-of-arguments #<subr max> 0)
  max()
  apply(max nil)
  (1+ (apply #'max (dgi--get-dired-files-length files)))

[lina-bh]

If anyone wants to hotfix this with an advice:

(define-advice dgi--get-dired-files-length
        (:around (fun &rest args))
      (or (apply fun args)
          '(0)))