Safe mode in Samsung Phones

I've noticed that the Safe mode mark on the bottom left part of my phone screen appears after my phone felt on the ground from the height of approximately one yard.

My phone always felt on the ground but this is the first time that I've encountered this case. The device may already reach the highest impact resistance that's why the Safe mode comes out.

Don't panic about this thing, all you have to do is to restart your phone by turning it off, wait some seconds then turn it on again. The Safe mode shall not display at this time.