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Grammar Question

I have a question about the usage of “the moment” in this following sentence.

We must not become complacent the moment we have some success.

Does this sentence contain any grammatical fallacy by using “the moment” instead of “when”?

Best,
Roy

Haha, yes. The example sentence is one from Spoken English.
the moment -> the moment when or when

Don’t use these example sentences in vocab group as formal written English examples.