Issue With gilab-Ci:: remote: HTTP Basic: Access denied

Its a Strange Behaviour by gitlab CI , Sometimes Pipeline is running into

HEAD is now at xxxx Merge branch ‘xxxxxxxxx’ into ‘development’
remote: HTTP Basic: Access denied
fatal: Authentication failed for ‘
ERROR: Job failed: exit status 1

If I re-run the Pipeline its working , Is it a bug in Gitlab …

MY runner version
Version: 10.7.0
Git revision: xxxxx
Git branch: 10-7-stable
GO version: go1.8.7
Built: 2018-04-22T13:43:35+00:00
OS/Arch: linux/amd64