fix out of bounds in inventory

subcommands/world/items.go

@@ -43,6 +43,9 @@ func (w *worldsServer) processItemPacketsServer(pk packet.Packet) packet.Packet
 
 	case *packet.InventorySlot:
 		if pk.WindowID == 0x0 {
+			if w.serverState.playerInventory == nil {
+				w.serverState.playerInventory = make([]protocol.ItemInstance, 36)
+			}
 			w.serverState.playerInventory[pk.Slot] = pk.NewItem
 		} else {
 			// save content

subcommands/world/world.go

@@ -550,8 +550,6 @@ func (w *worldsServer) SaveAndReset() {
 		f.Close()
 	}
 
-	time.Sleep(1 * time.Second)
-
 	// zip it
 	filename := folder + ".mcworld"
 	if err := utils.ZipFolder(filename, folder); err != nil {

utils/behaviourpack/bp.go

@@ -62,12 +62,40 @@ func (bp *BehaviourPack) CheckAddLink(pack utils.Pack) {
 		logrus.Error(err)
 		return
 	}
-	if len(bp.blocks) > 0 {
+
+	hasBlocksJson := false
+	if bp.HasBlocks() {
 		_, err = z.Open("blocks.json")
-		if err != nil {
-			return
+		if err == nil {
+			hasBlocksJson = true
 		}
 	}
+
+	hasEntitiesFolder := false
+	if bp.HasEntities() {
+		for _, f := range z.File {
+			if f.Name == "entity" && f.FileInfo().IsDir() {
+				hasEntitiesFolder = true
+				break
+			}
+		}
+	}
+
+	hasItemsFolder := false
+	if bp.HasItems() {
+		for _, f := range z.File {
+			if f.Name == "items" && f.FileInfo().IsDir() {
+				hasItemsFolder = true
+				break
+			}
+		}
+	}
+
+	// has no assets needed
+	if !(hasBlocksJson || hasEntitiesFolder || hasItemsFolder) {
+		return
+	}
+
 	h := pack.Manifest().Header
 	bp.AddDependency(h.UUID, h.Version)
 }
@@ -80,6 +108,10 @@ func (bp *BehaviourPack) HasItems() bool {
 	return len(bp.items) > 0
 }
 
+func (bp *BehaviourPack) HasEntities() bool {
+	return len(bp.entities) > 0
+}
+
 func (bp *BehaviourPack) HasContent() bool {
 	return bp.HasBlocks() || bp.HasItems()
 }