Add null checks

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/API.java

@@ -203,12 +203,20 @@ public class API implements IRSAPI {
     @Override
     @Nonnull
     public IStorageDisk<ItemStack> createDefaultItemDisk(ServerWorld world, int capacity) {
+        if (world == null) {
+            throw new IllegalArgumentException("World cannot be null");
+        }
+
         return new ItemStorageDisk(world, capacity);
     }
 
     @Override
     @Nonnull
     public IStorageDisk<FluidStack> createDefaultFluidDisk(ServerWorld world, int capacity) {
+        if (world == null) {
+            throw new IllegalArgumentException("World cannot be null");
+        }
+        
         return new FluidStorageDisk(world, capacity);
     }
 

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/storage/disk/factory/FluidStorageDiskFactory.java

@@ -16,6 +16,10 @@ public class FluidStorageDiskFactory implements IStorageDiskFactory<FluidStack>
 
     @Override
     public IStorageDisk<FluidStack> createFromNbt(ServerWorld world, CompoundNBT tag) {
+        if (world == null) {
+            throw new IllegalArgumentException("World cannot be null");
+        }
+
         FluidStorageDisk disk = new FluidStorageDisk(world, tag.getInt(FluidStorageDisk.NBT_CAPACITY));
 
         ListNBT list = tag.getList(FluidStorageDisk.NBT_FLUIDS, Constants.NBT.TAG_COMPOUND);
@@ -33,6 +37,10 @@ public class FluidStorageDiskFactory implements IStorageDiskFactory<FluidStack>
 
     @Override
     public IStorageDisk<FluidStack> create(ServerWorld world, int capacity) {
+        if (world == null) {
+            throw new IllegalArgumentException("World cannot be null");
+        }
+
         return new FluidStorageDisk(world, capacity);
     }
 }

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/storage/disk/factory/ItemStorageDiskFactory.java

@@ -17,6 +17,10 @@ public class ItemStorageDiskFactory implements IStorageDiskFactory<ItemStack> {
 
     @Override
     public IStorageDisk<ItemStack> createFromNbt(ServerWorld world, CompoundNBT tag) {
+        if (world == null) {
+            throw new IllegalArgumentException("World cannot be null");
+        }
+
         ItemStorageDisk disk = new ItemStorageDisk(world, tag.getInt(ItemStorageDisk.NBT_CAPACITY));
 
         ListNBT list = tag.getList(ItemStorageDisk.NBT_ITEMS, Constants.NBT.TAG_COMPOUND);
@@ -34,6 +38,10 @@ public class ItemStorageDiskFactory implements IStorageDiskFactory<ItemStack> {
 
     @Override
     public IStorageDisk<ItemStack> create(ServerWorld world, int capacity) {
+        if (world == null) {
+            throw new IllegalArgumentException("World cannot be null");
+        }
+
         return new ItemStorageDisk(world, capacity);
     }
 }