Some minor IO null checks

core/src/mindustry/world/modules/ItemModule.java

@@ -336,10 +336,13 @@ public class ItemModule extends BlockModule{
         for(int j = 0; j < count; j++){
             int itemid = legacy ? read.ub() : read.s();
             int itemamount = read.i();
-            items[content.item(itemid).id] = itemamount;
+            Item item = content.item(itemid);
+            if(item != null){
+                items[item.id] = itemamount;
                 total += itemamount;
             }
         }
+    }
 
     public interface ItemConsumer{
         void accept(Item item, int amount);

core/src/mindustry/world/modules/LiquidModule.java

@@ -162,14 +162,16 @@ public class LiquidModule extends BlockModule{
 
         for(int j = 0; j < count; j++){
             Liquid liq = content.liquid(legacy ? read.ub() : read.s());
-            int liquidid = liq.id;
             float amount = read.f();
+            if(liq != null){
+                int liquidid = liq.id;
                 liquids[liquidid] = amount;
                 if(amount > 0){
                     current = liq;
                 }
             }
         }
+    }
 
     public interface LiquidConsumer{
         void accept(Liquid liquid, float amount);