worldedit-core/src/main/java/com/fastasyncworldedit/core/extent/filter/block/CharFilterBlock.java

@@ -263,8 +263,7 @@ public class CharFilterBlock extends ChunkFilterBlock {
         final BlockMaterial material = state.getMaterial();
         if (material.hasContainer()) {
             final FaweCompoundTag tag = get.tile(x, y + yy, z);
-            assert tag != null : "has container but is null";
-            return state.toBaseBlock(tag.linTag());
+            return state.toBaseBlock(tag == null ? null : tag.linTag());
         }
         return state.toBaseBlock();
     }

worldedit-core/src/main/java/com/fastasyncworldedit/core/world/block/CompoundInput.java

@@ -17,8 +17,7 @@ public enum CompoundInput {
         @Override
         public BaseBlock get(final BlockState state, final IBlocks blocks, final int x, final int y, final int z) {
             final FaweCompoundTag tile = blocks.tile(x, y, z);
-            assert tile != null : "container without tile entity";
-            return state.toBaseBlock(tile.linTag());
+            return state.toBaseBlock(tile == null ? null : tile.linTag());
         }
     };
 

worldedit-core/src/main/java/com/sk89q/worldedit/extent/AbstractDelegateExtent.java

@@ -427,7 +427,7 @@ public class AbstractDelegateExtent implements Extent {
 
     @Override
     public boolean tile(int x, int y, int z, FaweCompoundTag tile) throws WorldEditException {
-        return setBlock(x, y, z, getBlock(x, y, z).toBaseBlock(tile.linTag()));
+        return setBlock(x, y, z, getBlock(x, y, z).toBaseBlock(tile == null ? null : tile.linTag()));
     }
     //FAWE end