diff --git a/core/src/main/java/org/geysermc/geyser/session/GeyserSession.java b/core/src/main/java/org/geysermc/geyser/session/GeyserSession.java
index 25dd21662..c2f94b1c6 100644
--- a/core/src/main/java/org/geysermc/geyser/session/GeyserSession.java
+++ b/core/src/main/java/org/geysermc/geyser/session/GeyserSession.java
@@ -222,7 +222,7 @@ public class GeyserSession implements GeyserConnection, GeyserCommandSource {
     private boolean closingInventory;
 
     @Setter
-    private InventoryTranslator inventoryTranslator = InventoryTranslator.PLAYER_INVENTORY_TRANSLATOR;
+    private @NonNull InventoryTranslator inventoryTranslator = InventoryTranslator.PLAYER_INVENTORY_TRANSLATOR;
 
     /**
      * Use {@link #getNextItemNetId()} instead for consistency
diff --git a/core/src/main/java/org/geysermc/geyser/translator/protocol/java/inventory/JavaOpenBookTranslator.java b/core/src/main/java/org/geysermc/geyser/translator/protocol/java/inventory/JavaOpenBookTranslator.java
index e7cf21a69..172880725 100644
--- a/core/src/main/java/org/geysermc/geyser/translator/protocol/java/inventory/JavaOpenBookTranslator.java
+++ b/core/src/main/java/org/geysermc/geyser/translator/protocol/java/inventory/JavaOpenBookTranslator.java
@@ -70,6 +70,7 @@ public class JavaOpenBookTranslator extends PacketTranslator<ClientboundOpenBook
             }
 
             InventoryTranslator translator = InventoryTranslator.inventoryTranslator(ContainerType.LECTERN);
+            Objects.requireNonNull(translator, "could not find lectern inventory translator!");
             session.setInventoryTranslator(translator);
 
             // Should never be null
diff --git a/core/src/main/java/org/geysermc/geyser/util/InventoryUtils.java b/core/src/main/java/org/geysermc/geyser/util/InventoryUtils.java
index 5951b4c6b..a07e8deac 100644
--- a/core/src/main/java/org/geysermc/geyser/util/InventoryUtils.java
+++ b/core/src/main/java/org/geysermc/geyser/util/InventoryUtils.java
@@ -92,7 +92,7 @@ public class InventoryUtils {
 
     public static void displayInventory(GeyserSession session, Inventory inventory) {
         InventoryTranslator translator = session.getInventoryTranslator();
-        if (translator != null && translator.prepareInventory(session, inventory)) {
+        if (translator.prepareInventory(session, inventory)) {
             if (translator instanceof DoubleChestInventoryTranslator && !((Container) inventory).isUsingRealBlock()) {
                 session.scheduleInEventLoop(() -> {
                     Inventory openInv = session.getOpenInventory();
@@ -115,6 +115,7 @@ public class InventoryUtils {
             ServerboundContainerClosePacket closePacket = new ServerboundContainerClosePacket(inventory.getJavaId());
             session.sendDownstreamGamePacket(closePacket);
             session.setOpenInventory(null);
+            session.setInventoryTranslator(InventoryTranslator.PLAYER_INVENTORY_TRANSLATOR);
         }
     }