Yes, some precautions should be taken while visiting the crowded ghats in Haridwar.
First, you should always take care of your personal belongings and not carry too much cash or expensive jewelry. The crowds can get very large, so it is important to be vigilant and make sure you don't get lost.
Secondly, wearing appropriate footwear is important as the ghats can be slippery.
If you wish to take a holy dip, do so under the supervision of a local guide or an experienced swimmer, as the current of the river can be very strong. Always respect local customs and traditions.