diff --git a/docs/sdk/client-side-sdks/javascript.md b/docs/sdk/client-side-sdks/javascript.md
index c9f5ee0e..0f8ca718 100644
--- a/docs/sdk/client-side-sdks/javascript.md
+++ b/docs/sdk/client-side-sdks/javascript.md
@@ -264,8 +264,9 @@ dvcClient.subscribe(
   "variableUpdated:*",
   (key: string, variable: DVCVariable) => {
     // key is the variable that has been updated
-    // The new value can be accessed from the variable object passed in: variable.value
-    console.log(`New variable value for variable ${key}: ${variable.value}`);
+    // The new value can be accessed from the variable object passed in: variable?.value
+    // The variable argument will be undefined if the variable is no longer being served a value 
+    console.log(`New variable value for variable ${key}: ${variable?.value}`);
   }
 );
 ```