diff --git a/deno.json b/deno.json
index 0adb412..774940b 100644
--- a/deno.json
+++ b/deno.json
@@ -1,6 +1,6 @@
 {
   "name": "@denosaurs/log",
-  "version": "0.0.15",
+  "version": "0.0.16",
   "exports": {
     ".": "./mod.ts",
     "./utils/noop_console": "./utils/noop_console.ts",
diff --git a/utils/transfer_symbols.ts b/utils/transfer_symbols.ts
index 2e31733..3e65f20 100644
--- a/utils/transfer_symbols.ts
+++ b/utils/transfer_symbols.ts
@@ -2,10 +2,10 @@
  * Transfer symbols and their values as is from {@link value} to {@link target}.
  */
 export function transferSymbols<T>(value: T, target: T): T {
-  const properties = Object.getOwnPropertyNames(
-    value,
-  ) as (keyof typeof value)[];
-  const symbols = Object.getOwnPropertySymbols(value) as (keyof typeof value)[];
+  if (value === null || value === undefined) return target;
+
+  const properties = Object.getOwnPropertyNames(value) as (keyof T)[];
+  const symbols = Object.getOwnPropertySymbols(value) as (keyof T)[];
 
   for (const property of properties) {
     const entry = value[property];