elfeed filter hydra error when press @ to complete-age

When using `my/elfeed-search-view-hydra` `@` keybinding to `complete-age`, the error occurs that
```
Wrong type argument: stringp, (lambda nil (interactive) (let ((save-match-data-internal (match-data))) (unwind-protect (progn (let* ((date-regexp "\\(\\(?:\\‘\\|[[:blank:]]\\)@[[:digit:]]+[^[:blank:]]+\\)") (date-tag (if (string-match date-regexp elfeed-search-filter) (progn (match-string 1 elfeed-search-filter))))) (elfeed-search-set-filter (replace-regexp-in-string date-regexp (read-string "Date: " date-tag) elfeed-search-filter t t)))) (set-match-data save-match-data-internal ’evaporate))))
```