Why ArcMap 10.2 crashes when running model?

I`m running a simple model in ArcMap 10.2, which makes my ArcMap crashing (closing and then an error message pops in saying that ArcMap has encountered a serious error, and there is an option to report it to ESRI). Basically I want to rasterise some polygons, so I built a model: Iterate Feature Class> Project> Polygon To Raster. Does anyone have an idea why my ArcMap crashes when I run this particular model? (I do run a lot of different model, but have never encountered this issue before...)