When user import records of project and if it contains tags in the file, a traceback will appear. Steps to reproduce the error: - Go to project > Favorites > Import records > Upload File Note: Make sure that file contains tags Error: A traceback appears: "TypeError: unsupported operand type(s) for +=: NoneType and list" https://github.com/odoo/odoo/blob/0480005e4498d76fe7a3446693f41500122e41d7/addons/project/models/project.py#L2763 When user import records that contains tags, here args will be None. So it will lead to above traceback. sentry-4494554048 closes odoo/odoo#136973 X-original-commit: 9e14cf0fb618c517fe12138416e40c3e66383276 Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>