Google LLC asked a federal court to dismiss a proposed class action over data leaks caused by two software bugs in its now-defunct Google+ social network platform.

The proposed class members haven’t offered any facts showing they were harmed by the bugs, Google said in a motion to dismiss filed April 10 in the U.S. District Court for the Northern District of California.

Nor have the plaintiffs shown that any of their personal information could have been affected by the...