I speak Chinese, Japanese, and french, and yes, I stutter in all of them. However I stutter on different sounds in different languages. I stutter on hard sounds in Japanese and English, I stutter on soft vocalised sounds in french (je), and on dip tones in Chinese (我）. However, what's weird is that I don't stutter when I start learning a language. I'm working on Russian right now, and I don't stutter yet. It's only when words flow fluently out that I start to stutter.