add more null checks

paper/src/main/java/com/badbones69/crazyauctions/api/guis/types/CurrentMenu.java

@@ -164,7 +164,11 @@ public class CurrentMenu extends Holder {
     }
 
     public void calculateItems() {
-        this.items = this.userManager.getAuctions().get(this.player.getUniqueId());
+        final UUID uuid = this.player.getUniqueId();
+
+        if (this.userManager.hasAuction(uuid)) {
+            this.items = this.userManager.getAuctions(uuid);
+        }
 
         this.maxPages = getMaxPage(this.items);
     }

paper/src/main/java/com/badbones69/crazyauctions/api/guis/types/ExpiredMenu.java

@@ -51,7 +51,11 @@ public class ExpiredMenu extends Holder {
                 "WhatIsThis.Cancelled/ExpiredItems"
         ));
 
-        this.items = this.userManager.getExpiredItems().get(this.player.getUniqueId());
+        final UUID uuid = this.player.getUniqueId();
+
+        if (this.userManager.hasExpiredItem(uuid)) {
+            this.items = this.userManager.getExpiredItems(uuid);
+        }
 
         this.maxPages = getExpiredMaxPages(this.items == null ? new ArrayList<>() : this.items);
 

paper/src/main/java/com/badbones69/crazyauctions/tasks/UserManager.java

@@ -152,6 +152,14 @@ public class UserManager {
         return this.auctions;
     }
 
+    public final boolean hasAuction(final UUID uuid) {
+        return this.auctions.containsKey(uuid);
+    }
+
+    public final List<AuctionItem> getAuctions(final UUID uuid) {
+        return this.auctions.get(uuid);
+    }
+
     public final void updateExpiredCache() {
         this.expired_items.clear();
 
@@ -304,6 +312,14 @@ public class UserManager {
         return this.expired_items;
     }
 
+    public final boolean hasExpiredItem(final UUID uuid) {
+        return this.expired_items.containsKey(uuid);
+    }
+
+    public final List<ExpiredItem> getExpiredItems(final UUID uuid) {
+        return this.expired_items.get(uuid);
+    }
+
     public void addActiveAuction(final String uuid, final ConfigurationSection section) {
         final AuctionItem new_auction = new AuctionItem(uuid, section.getString("name"),
                 section.getName(),