If while one is performing ghusl he has a minor occurrence (al‑ḥadath al‑aṣghar)[2] – for example, he urinates – it is not necessary for him to stop performing the ghusl and start another ghusl [all over again]; rather, he can complete his ghusl but based on obligatory precaution, he will require wuḍūʾ [for performing acts that require wuḍūʾ].
However, if [one has a minor occurrence while performing a sequential ghusl and] he changes from performing a sequential ghusl to an immersive one, or [if one has a minor occurrence while performing an immersive ghusl and he changes from performing] an immersive ghusl to a sequential one, then it is not necessary for him also to perform wuḍūʾ.