# \[TOFIX\] Bug? 'rank must be a number' error while try to drag card to another row in 'board view' **URL:** \ **Category:** Bugs & Issues\ **Created:** [November 12, 2019, 3:13pm UTC](https://community.fibery.io/t/tofix-bug-rank-must-be-a-number-error-while-try-to-drag-card-to-another-row-in-board-view/402 "2019-11-12T15:13:47Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![alex.mart](https://sea2.discourse-cdn.com/flex020/user_avatar/community.fibery.io/alex.mart/32/247_2.png) [@alex.mart](https://community.fibery.io/u/alex.mart)\ **Post date:** [November 12, 2019, 3:13pm UTC](https://community.fibery.io/t/tofix-bug-rank-must-be-a-number-error-while-try-to-drag-card-to-another-row-in-board-view/402/1 "2019-11-12T15:13:47Z")
`{ type: 'Software~Development/Task', id: '8b807350-055d-11ea-be5f-65c62d58a7f2', rank: null } 'rank must be a number'` Error after dragging card (task entity) to change ‘related entity’ (customer entity) Another word, i try to change customer of task. Previously, such an error has never appeared after the same actions! ![image](https://us1.discourse-cdn.com/flex020/uploads/fibery/original/2X/4/4726b87b5f468cbedc583e803838be2cb4a917f5.png) i start drag from here ![image](https://us1.discourse-cdn.com/flex020/uploads/fibery/original/2X/8/88bc268d8136e714d35d8ac69d1155398b24d04a.png) i try to put it here: ![image](https://us1.discourse-cdn.com/flex020/uploads/fibery/original/2X/4/405f131d399c5b4b862718070894b5c9c9c051a9.png) My console: ![image](https://us1.discourse-cdn.com/flex020/uploads/fibery/original/2X/6/63c6c3f300cf37587c316d06b25bb5e64f166520.png) May be it is linked to issue [[✔️ FIXED] Cannot reorder cards once certain rank is reached - #3 by Shafqat\_Ullah](https://community.fibery.io/t/tofix-cannot-reorder-cards-once-certain-rank-is-reached/115/3) but i can’t see “Recalculate button” on the same place. And after that, i succefully move this card with no errors!