Fix the willItemsFit bank method

src/empty.mts

@@ -24,8 +24,9 @@ export async function getNextEmpty(ctx: ItemPlaceholderContext) {
   for (let i = 0; i < countEmpties; i++) {
     const emptyId = `item_placeholder:empty_i_${i}`;
     const item = game.items.getObjectByID(emptyId);
-
-    if (!game.bank.items.has(item)) {
+    if (!item) {
+      break;
+    } else if (!game.bank.items.has(item)) {
       return emptyId;
     }
   }

src/setup.mts

@@ -206,6 +206,23 @@ export async function setup(ctx: ItemPlaceholderContext) {
     }
   });
 
+  ctx.patch(Bank, 'willItemsFit').replace(function (original, items) {
+    const useSlots = ctx.settings.section('General').get('use-slots');
+    if (useSlots) {
+      const newItems = new Set();
+      return items.every(({ item }) => {
+        if (this.items.has(item)) {
+          return true;
+        } else {
+          newItems.add(item);
+          return this.occupiedSlots + newItems.size <= this.maximumSlots;
+        }
+      });
+    } else {
+      return original(items);
+    }
+  });
+
   const runIfValidItem = (onPlaceholderFound: (item: Item) => void) =>
     function <P extends unknown[], T extends (item: Item, ...args: P) => void>(
       this: Bank,

src/ui.mts

@@ -118,6 +118,9 @@ export async function setupUI(ctx: ItemPlaceholderContext) {
       async createEmpty() {
         const itemID = await getNextEmpty(ctx);
         const item = game.items.getObjectByID(itemID);
+        if (!item) {
+          return;
+        }
         game.bank.addItem(item, 1, false, false, true, false);
         const bankItem = game.bank.items.get(item);
         if (bankItem) {