Dual nationals who hold Pakistani citizenship do not require a visa when entering on a valid Pakistani passport.
Citizenship recognition
If you possess Pakistani nationality, you are considered a citizen while in the country and are not subject to tourist visa requirements.
Traveling on a foreign passport
If you choose to travel using only a foreign passport and do not present a valid Pakistani passport, visa rules for your foreign nationality may apply.
Preparation
Ensuring your Pakistani passport is valid before travel helps avoid confusion at immigration.