Employees create instances via the frontend. After save / submit sometimes an entry appears twice. Why does this happen, and how can it be avoided?

Hello

When
1. some user submit "Creation of Instance",
2. instance saved to database
3. but when browser is processing web application reply, some error happened
4. and client not see: "positive reply", He press F5 - so the same data send to DataBase again

Yes, possible create some algorithm, "As example: duplicate title not permit" So when 1 user add 2 instances with same "Title", for 2 instance, client will see error, But This client will continue not understand first instance from another Client or not...

Regards
OrdaSoft team