Vectrix with a flat tire :-(

Yesterday, on my way back from work, at one point, the Vectrix felt a bit sluggish, something was wrong

So when I finally got home, I realized the rear tire pressure was low 

So I quickly went to a small gas station where they can fix tires which a kind of rubber plug (I had this done for Prius and LEAF (yes at 400 km, no luck))