diff --git a/src/order/OrderList.js b/src/order/OrderList.js
index bfdba52282f2a30b84ce664d37d365c3c031a15c..d7bd38fbd6af170f37b4cf51360b4c96c5e0ab5f 100644
--- a/src/order/OrderList.js
+++ b/src/order/OrderList.js
@@ -6,7 +6,7 @@ import Fetcher from "../Fetcher";
 function OrderList() {
   const [orders, setOrders] = useState([]);
   const order_list = orders.map((o) => (
-    <Card as={Col} sm={4}>
+    <Card key={o.ID} as={Col} sm={4}>
       <Card.Body>
         <Card.Title>{o.name}</Card.Title>
         <Card.Text>{o.description}</Card.Text>
diff --git a/src/transaction/MyTransactions.js b/src/transaction/MyTransactions.js
index 1b0494496388e00b12e1d55fdcaf3134d809c41b..97693af24c26e8c3653ba9c353e26d8b924b8ffa 100644
--- a/src/transaction/MyTransactions.js
+++ b/src/transaction/MyTransactions.js
@@ -10,7 +10,7 @@ function MyTransactions() {
 
   const entries = transactions.map((transaction) => {
     return (
-      <TransactionTr transaction={transaction}>
+      <TransactionTr key={transaction.ID} transaction={transaction}>
         <td>{icon(transaction)}</td>
         <td>{printDate(transaction.date)}</td>
         <td>{printMoney(transaction.total) + " €"}</td>
diff --git a/src/transaction/TransactionList.js b/src/transaction/TransactionList.js
index 93278e9cce88989c04095a548a30c8b1cb82051e..0367e412d35489bd8b028ae08d00bcc3db952795 100644
--- a/src/transaction/TransactionList.js
+++ b/src/transaction/TransactionList.js
@@ -43,7 +43,7 @@ function TransactionList() {
 
   const entries = transactions.map((transaction) => {
     return (
-      <TransactionTr transaction={transaction}>
+      <TransactionTr key={transaction.ID} transaction={transaction}>
         <td>{icon(transaction)}</td>
         <td>{printTransactionID(transaction)}</td>
         <td>{printDate(transaction.date)}</td>