Received two W-2s. Missouri and Kansas

I live in Missouri, but I work in Kansas. I received two W-2s from my employer. The Kansas W-2 has boxes 15-17 filled out; whereas, the Missouri W-2 has all the essential boxes filled out, 1-6, 12, 13, 15-16, 18-20; leaving 17 (state income tax blank). How should I file for federal and state? Do I include both W-2s in federal and in state? I tried filing both in federal and it said to remove duplicate forms to prevent errors when filing. So should I only include Missouri in federal and both in state?