“Bullet hole - a small stone from the universe went through our solar array. Glad it missed the hull.” - Col. Chris Hadfield, commander of the International Space Station. 29 April 2012.
Remember folks that life in space is far from easy. There are any number of things that could go wrong, and an equal amount of hazards that one must be wary from. In this case, a small micrometeroid or space debris.
Also, it’s interesting to note the degradation of the solar panels after all these years, as seen by the large amount of torn/missing foil.