fix: skip if fileInfo is nil

main.go

@@ -100,6 +100,9 @@ func removeSuffix(suffix string) filepath.WalkFunc {
 }
 
 func normalize(p string, f os.FileInfo, err error) error {
+	if f == nil {
+		return nil
+	}
 	filename := f.Name()
 	if skip, err := skipDir(filename); skip {
 		return err