The pilot was practicing touch-and-go takeoffs and landings at the airport in Camarillo, California.
During the second landing he failed to maintain directional control.
The Piper PA-18 subsequently departed the side of the runway, and ground looped, which resulted in substantial damage to the left wing and left lift strut.
The pilot reported there were no pre-impact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operations.
Probable cause: The pilot’s failure to maintain directional control during the landing roll.
NTSB Identification: WPR15CA114
This February 2015 accident report is provided by the National Transportation Safety Board. Published as an educational tool, it is intended to help pilots learn from the misfortunes of others.

Was Harrison Ford checking out in this one also?
Oh those tail wheel airplanes. How they love to swing and sway their rear ends on the runway especially in crosswinds. Sounds like an ad for a burlesque show only these rear ends can throw you for a loop, a ground loop to be precise, if allowed to swing too much. Gotta pay attention to their noses and be quick on the rudders with happy feet to correct any deviations from straight ahead. Steerable tail wheels help when in 3-point whence the magnitude of rudder inputs can be reduced lest an over control, directional PIO, induces an unnecessary ground loop.