diff --git a/src/library.js b/src/library.js
index <HASH>..<HASH> 100644
--- a/src/library.js
+++ b/src/library.js
@@ -82,6 +82,7 @@
       } else if (Isla.Utils.type(o) === "String" ||
                  Isla.Utils.type(o) === "Boolean" ||
                  Isla.Utils.type(o) === "Function") {
+                 o === null) {
         c = o;
       }
Fix library.clone so it preserves nulls.