Handle potential null pointers.

Author: noobanidus

src/main/java/noobanidus/mods/lootr/block/entities/TileTicker.java

@@ -156,7 +156,9 @@ public static void serverTick(TickEvent.ServerTickEvent event) {
         level.destroyBlock(entry.getPosition(), false);
         level.setBlock(entry.getPosition(), replacement, 2);
         blockEntity = level.getBlockEntity(entry.getPosition());
-        blockEntity.getPersistentData().merge(oldData);
+        if (blockEntity != null) {
+          blockEntity.getPersistentData().merge(oldData);
+        }
         if (blockEntity instanceof ILootBlockEntity) {
           ((RandomizableContainerBlockEntity) blockEntity).setLootTable(table, seed);
         } else {