If the operation is idempotent, then there is no harm in performing the operation two or more times.
See the Wikipedia article on idempotence for more information.
The mathematical definition of idempotent is only superficially different.
In computing, an idempotent operation is one that has no additional effect if it is called more than once with the same input parameters.
For example, removing an item from a set can be considered an idempotent operation on the set.
In mathematics, an idempotent operation is one where Idempotent operations are often used in the design of network protocols, where a request to perform an operation is guaranteed to happen at least once, but might also happen more than once.
I called her, we chatted for a while and I invited her for tea (I used to do it).
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With difficulty washing off the inscription on his chest, she came out of the bathroom.