git.delta.rocks / unique-network / refs/commits / 4d3b24fb930e

177			.checked_add(1)177			.checked_add(1)
178			.ok_or(ArithmeticError::Overflow)?;178			.ok_or(ArithmeticError::Overflow)?;
179179
180		let balance = <AccountBalance<T>>::get((collection.id, sender))
181			.checked_sub(1)
182			.ok_or(ArithmeticError::Overflow)?;
183
184		if balance == 0 {
185			<AccountBalance<T>>::remove((collection.id, sender));
186		} else {
187			<AccountBalance<T>>::insert((collection.id, sender), balance);
188		}
180		// =========189		// =========
181190
182		<Owned<T>>::remove((collection.id, &token_data.owner, token));191		<Owned<T>>::remove((collection.id, &token_data.owner, token));