Issue Summary

When creating a label through an API call, duplicate labels are being generated.

Steps to Reproduce

1. https://api.trello.com/1/boards/<board id>/labels"
2. Call the above API multiple times with the same label consecutively.
3. If the calls occur simultaneously, the labels will be created two or more times, which should not happen.

Expected Results

Labels should be unique for each board.

Actual Results

Duplicate labels are getting generated.

Workaround

Introduce a delay between each call to prevent duplicate labels from getting generated.