You can no longer ban or mute a player who is already banned or muted.

src/main/java/com/songoda/ultimatemoderation/command/commands/CommandBan.java

@@ -50,6 +50,12 @@ public class CommandBan extends AbstractCommand {
             return ReturnType.FAILURE;
         }
 
+        if (instance.getPunishmentManager().getPlayer(player).getActivePunishments()
+                .stream().anyMatch(appliedPunishment -> appliedPunishment.getPunishmentType() == PunishmentType.BAN)) {
+            sender.sendMessage(instance.getReferences().getPrefix() + "That player is already banned.");
+            return ReturnType.FAILURE;
+        }
+
         new Punishment(PunishmentType.BAN, duration == 0 ? -1 : duration, reason.equals("") ? null : reason)
                 .execute(sender, player);
 

src/main/java/com/songoda/ultimatemoderation/command/commands/CommandMute.java

@@ -50,6 +50,12 @@ public class CommandMute extends AbstractCommand {
             return ReturnType.FAILURE;
         }
 
+        if (instance.getPunishmentManager().getPlayer(player).getActivePunishments()
+                .stream().anyMatch(appliedPunishment -> appliedPunishment.getPunishmentType() == PunishmentType.MUTE)) {
+            sender.sendMessage(instance.getReferences().getPrefix() + "That player is already muted.");
+            return ReturnType.FAILURE;
+        }
+
         new Punishment(PunishmentType.MUTE, duration == 0 ? -1 : duration, reason.equals("") ? null : reason)
                 .execute(sender, player);
 

src/main/java/com/songoda/ultimatemoderation/command/commands/CommandUnBan.java

@@ -33,6 +33,12 @@ public class CommandUnBan extends AbstractCommand {
             return ReturnType.FAILURE;
         }
 
+        if (!instance.getPunishmentManager().getPlayer(player).getActivePunishments()
+                .stream().anyMatch(appliedPunishment -> appliedPunishment.getPunishmentType() == PunishmentType.BAN)) {
+            sender.sendMessage(instance.getReferences().getPrefix() + "That player isn't banned.");
+            return ReturnType.FAILURE;
+        }
+
         PlayerPunishData playerPunishData = instance.getPunishmentManager().getPlayer(player);
 
         playerPunishData.expirePunishments(PunishmentType.BAN);

src/main/java/com/songoda/ultimatemoderation/command/commands/CommandUnMute.java

@@ -32,6 +32,12 @@ public class CommandUnMute extends AbstractCommand {
             return ReturnType.FAILURE;
         }
 
+        if (!instance.getPunishmentManager().getPlayer(player).getActivePunishments()
+                .stream().anyMatch(appliedPunishment -> appliedPunishment.getPunishmentType() == PunishmentType.MUTE)) {
+            sender.sendMessage(instance.getReferences().getPrefix() + "That player isn't muted.");
+            return ReturnType.FAILURE;
+        }
+
         PlayerPunishData playerPunishData = instance.getPunishmentManager().getPlayer(player);
 
         playerPunishData.expirePunishments(PunishmentType.MUTE);