diff --git a/src/main/java/Model/Player.java b/src/main/java/Model/Player.java
index e7a1e31..cf3d8a3 100644
--- a/src/main/java/Model/Player.java
+++ b/src/main/java/Model/Player.java
@@ -9,6 +9,16 @@ public class Player {
     private TransactionArchive transactionArchive;
 
     public Player(String name, BigDecimal startingMoney) {
+        if (name == null || name.isBlank()) {
+            throw new IllegalArgumentException("Player name cannot be null or blank");
+        }
+        if (startingMoney == null) {
+            throw new IllegalArgumentException("Starting money cannot be null");
+        }
+        if (startingMoney.compareTo(BigDecimal.ZERO) < 0) {
+            throw new IllegalArgumentException("Starting money cannot be negative");
+        }
+
         this.name = name;
         this.startingMoney = startingMoney;
         this.money = startingMoney;
@@ -25,10 +35,22 @@ public BigDecimal getMoney() {
     }
 
     public void addMoney(BigDecimal amount) {
+        if (amount == null) {
+            throw new IllegalArgumentException("Amount cannot be null");
+        }
+        if (amount.compareTo(BigDecimal.ZERO) < 0) {
+            throw new IllegalArgumentException("Amount to add cannot be negative");
+        }
         this.money = this.money.add(amount);
     }
 
     public void withdrawMoney(BigDecimal amount) {
+        if (amount == null) {
+            throw new IllegalArgumentException("Amount cannot be null");
+        }
+        if (amount.compareTo(BigDecimal.ZERO) < 0) {
+            throw new IllegalArgumentException("Amount to withdraw cannot be negative");
+        }
         this.money = this.money.subtract(amount);
     }