Hawaii warns visitors coming to view Kilauea’s most recent eruption to be careful after a toddler snuck under a barrier and almost fell off a cliff into the active volcano. The little boy was just about a foot away from ‘a fatal fall’ before his ‘screaming’ mother managed to grab him.

The National Park Service said a “shocking scene unfolded” Christmas Day as viewers gathered to watch Kilauea’s lava at Kaluapele, the summit caldera, around sunset.

“A toddler wandered off from his family and in a split second, ran straight toward the 400-foot cliff edge,” according to the release. “His mother, screaming, managed to grab him in the nick of time just a foot or so away from a fatal fall. Disaster was averted, and the shaken family departed. A Christmas to remember?”