Praise be to Allah.
The Standing Committee was asked a similar question and they said:
Having an erection does not invalidate Wudu if nothing comes out of the penis, because an erection is not one of the things that invalidate Wudu.
For more details, please refer to the following answers: 82759 , 201227 , 134956 , and 40126 .
And Allah knows best.
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