Requested Changes

src/main/java/ch/njol/skript/effects/EffBlockUpdate.java

@@ -52,7 +52,8 @@ public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelaye
 	@Override
 	protected void execute(Event event) {
 		BlockData data = this.blockData.getSingle(event);
-		assert data != null;
+		if (data == null)
+			return;
 		for (Block block : this.blocks.getArray(event)) {
 			block.setBlockData(data, this.physics);
 		}

src/test/skript/tests/syntaxes/effects/EffBlockUpdate.sk

@@ -3,6 +3,6 @@ test "block update":
 	set {_blocks::*} to blocks in radius 2 of block at {_loc}
 
 	update blocks at {_blocks::*} as sand without physics updates
-	assert blocks at {_blocks::*} is sand with "1 or more block did not update with or without physics"
+	assert blocks at {_blocks::*} is sand with "1 or more blocks did not update with or without physics"
 	update blocks at {_blocks::*} as air without physics updates
-	assert blocks at {_blocks::*} is air with "1 or more block did not update to air"
+	assert blocks at {_blocks::*} is air with "1 or more blocks did not update to air"