--- a/pallets/fungible/src/lib.rs
+++ b/pallets/fungible/src/lib.rs
@@ -403,13 +403,20 @@
 			)?;
 		}
 
+		let updated_balances = data
+			.into_iter()
+			.map(|(user, amount)| {
+				let updated_balance = <Balance<T>>::get((collection.id, &user))
+					.checked_add(amount)
+					.ok_or(ArithmeticError::Overflow)?;
+				Ok((user, amount, updated_balance))
+			})
+			.collect::<Result<Vec<_>, DispatchError>>()?;
+
 		// =========
 
 		<TotalSupply<T>>::insert(collection.id, total_supply);
-		for (user, amount) in data {
-			let updated_balance = <Balance<T>>::get((collection.id, &user))
-				.checked_add(amount)
-				.ok_or(ArithmeticError::Overflow)?;
+		for (user, amount, updated_balance) in updated_balances {
 			<Balance<T>>::insert((collection.id, &user), updated_balance);
 			<PalletStructure<T>>::nest_if_sent_to_token_unchecked(
 				&user,