Possible Duplicate:
Auto-inserted “possible duplicate” comment does not trim whitespace from question title
Why not remove trailing spaces after a question title?

The auto-created comment,

possible duplicate of [Title](URL)

If Title happens to end with a space, as it happened here, the resulting comment is broken:

possible duplicate of [How to group time by hour or by 10 minutes ](https://stackoverflow.com/questions/5002661/how-to-group-time-by-hour-or-by-10-minutes)

Please remove the trailing whitespace for the purpose of auto-creating comments.