# Action "Replace Comment field " doesnt work **URL:** \ **Category:** Support\ **Created:** [February 26, 2020, 6:56pm UTC](https://community.mp3tag.de/t/action-replace-comment-field-doesnt-work/48002 "2020-02-26T18:56:27Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![MP3Tagger](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/m/8edcca/32.png) [@MP3Tagger](https://community.mp3tag.de/u/MP3Tagger)\ **Post date:** [February 26, 2020, 6:56pm UTC](https://community.mp3tag.de/t/action-replace-comment-field-doesnt-work/48002/1 "2020-02-26T18:56:27Z")
I created a user action because i want to remove some fields (this works fine) and replace every existing comment or empty comment fields by a unique string (this only works temporary): Here the result (in german) i get in the Action window after creating the actions: Ersetzen "COMMENT": "\*" -\> "Musik-Archiv" Tag-Felder entfernen "TRACK;ALBUM;ALBUMARTIST;COMPOSER;DISCNUMBER" When i afterwards select all files in a folder and start the action first time the comment fields are changed. But selecting a new directory and start the same action comment fiels are not changed furtheron. When i insert the string "Musik-Archiv" manually in the left-hand site comment-select field and press disk symbol (save) the comment fields get changed. But running the action nothing happened to the comment field....??? - Mysterious - isnt it?? Joe ---
**Author:** ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)\ **Post date:** [February 26, 2020, 7:03pm UTC](https://community.mp3tag.de/t/action-replace-comment-field-doesnt-work/48002/2 "2020-02-26T19:03:20Z")
Empty fields do not exist. Therefore you cannot "replace" a non-existent contents with something else. If you want to set certain values into a field then use an action of the type "Format value" or the function Convert\>Tag-Tag ---
**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\ **Post date:** [February 9, 2026, 12:28pm UTC](https://community.mp3tag.de/t/action-replace-comment-field-doesnt-work/48002/3 "2026-02-09T12:28:28Z")