Fix #4

src/main/java/net/knarcraft/playerpayouts/command/SetGroupPaymentCommand.java

@@ -11,6 +11,8 @@ import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.Arrays;
+
 /**
  * A command for overriding payments for specific groups
  */
@@ -41,6 +43,11 @@ public class SetGroupPaymentCommand implements CommandExecutor {
             return false;
         }
 
+        if (Arrays.stream(PermissionManager.getPermissionGroups()).noneMatch(item -> item.equals(arguments[0]))) {
+            stringFormatter.displayErrorMessage(commandSender, Translatable.GROUP_INVALID);
+            return false;
+        }
+
         try {
             String group = arguments[0];
             if (StringHelper.isNonValue(arguments[1])) {

src/main/java/net/knarcraft/playerpayouts/config/Translatable.java

@@ -53,6 +53,11 @@ public enum Translatable implements TranslatableMessage {
      */
     PAYOUT_RECEIVED,
 
+    /**
+     * The message displayed when an invalid permission group has been provided
+     */
+    GROUP_INVALID,
+
     ;
 
     @Override

src/main/resources/strings.yml

@@ -8,3 +8,4 @@ en:
   PAYOUT_NUMBER_REQUIRED: "Payout must be a number"
   PLAYER_ID_REQUIRED: "You must supply a valid name of an online player, or a UUID"
   PAYOUT_RECEIVED: "You got a paycheck of {value}"
+  GROUP_INVALID: "You have specified an invalid permission group"