error when adding a (new) layer to a branch other than the first one

[gioman]

• create a new branch
• add a new geopackage vector to QGIS
• try "add layer to repository" and choose to add to the new branch:

HTTPError: 500 Server Error: Internal Server Error for url: http://192.168.1.87:8182/tasks/49/download

Traceback (most recent call last):
  File "C:/Users/qgis/.qgis2/python/plugins\geogig\gui\dialogs\importdialog.py", line 127, in importClicked
    self.repo.checkoutlayer(filename, layername)
  File "C:/Users/qgis/.qgis2/python/plugins\geogig\geogigwebapi\repository.py", line 337, in checkoutlayer
    self._downloadfile(taskid, filename)
  File "C:/Users/qgis/.qgis2/python/plugins\geogig\geogigwebapi\repository.py", line 194, in _downloadfile
    r.raise_for_status()
  File "C:\Users\qgis\.qgis2\python\plugins\geogig\ext-libs\requests-2.10.0-py2.7.egg\requests\models.py", line 844, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
HTTPError: 500 Server Error: Internal Server Error for url: http://192.168.1.87:8182/tasks/49/download

• after clicking "close" in error dialog and "cancel" in "add layer to repository" dialog you can notice that the commit message is available in history panel, but the layer is NOT listed in respository summary.