diff --git a/x/typesutil/check.go b/x/typesutil/check.go
index f91650562..dad82567d 100644
--- a/x/typesutil/check.go
+++ b/x/typesutil/check.go
@@ -111,6 +111,9 @@ func (p *Checker) Files(goFiles []*goast.File, gopFiles []*ast.File) (err error)
 	gopfs := make(map[string]*ast.File)
 	for _, goFile := range goFiles {
 		f := fset.File(goFile.Pos())
+		if f == nil {
+			continue
+		}
 		file := f.Name()
 		fname := filepath.Base(file)
 		if strings.HasPrefix(fname, "gop_autogen") {
@@ -121,6 +124,9 @@ func (p *Checker) Files(goFiles []*goast.File, gopFiles []*ast.File) (err error)
 	}
 	for _, gopFile := range gopFiles {
 		f := fset.File(gopFile.Pos())
+		if f == nil {
+			continue
+		}
 		gopfs[f.Name()] = gopFile
 	}
 	if debugVerbose {
diff --git a/x/typesutil/check_test.go b/x/typesutil/check_test.go
index fbbbe0acb..703118c1f 100644
--- a/x/typesutil/check_test.go
+++ b/x/typesutil/check_test.go
@@ -185,3 +185,13 @@ var i int = "hello"
 		t.Fatal("no error")
 	}
 }
+
+func TestBadFile(t *testing.T) {
+	conf := &types.Config{}
+	opt := &typesutil.Config{}
+	opt.Fset = token.NewFileSet()
+	opt.Types = types.NewPackage("", "main")
+	checker := typesutil.NewChecker(conf, opt, nil, nil)
+	_ = checker.Files([]*goast.File{&goast.File{Name: goast.NewIdent("main")}},
+		[]*ast.File{&ast.File{Name: ast.NewIdent("main")}})
+}