src/de/steamwar/misslewars/commands/CommandAcceptDecline.java

@@ -46,7 +46,7 @@ public class CommandAcceptDecline implements CommandExecutor {
             return false;
         }
 
-        if (command.getName().equals("accept")) {
+        if (command.getName().equalsIgnoreCase("accept")) {
             teamInvitation.acceptInvite(player);
         } else {
             MWTeam.removeInvitations(player);