"It was a long throw into the box and Chris (Iwelumo) went down. Some you get and some you don't and Leicester feel very disappointed with it," Williams said after the 1-1 draw at Layer Road.
"I have since seen it on the video and I think that they have a point.
"Dean (Gerken) kept us in the game with some good saves in the first half.
"We were certainly not firing on all cylinders, so I suppose in the end we have to be happy with the point.
"It didn't quite work for us in the first half. We looked a bit flat but you must give credit to Leicester, especially their front two who looked very sharp."