diff --git a/challenges/01-front-end-development-certification/basic-javascript.json b/challenges/01-front-end-development-certification/basic-javascript.json
index dcf7274e6f..195b23e42b 100644
--- a/challenges/01-front-end-development-certification/basic-javascript.json
+++ b/challenges/01-front-end-development-certification/basic-javascript.json
@@ -1841,8 +1841,8 @@
       ],
       "tests": [
         "assert(typeof myFunction === 'function', 'message: <code>myFunction</code> should be a function');",
-        "capture(); myFunction(1,2); uncapture(); assert(logOutput == 3, 'message: <code>myFunction(1,2)</code> should output <code>3</code>');",
-        "capture(); myFunction(7,9); uncapture(); assert(logOutput == 16, 'message: <code>myFunction(7,9)</code> should output <code>16</code>');",
+        "if(typeof myFunction === \"function\") { capture(); myFunction(1,2); uncapture(); } assert(logOutput == 3, 'message: <code>myFunction(1,2)</code> should output <code>3</code>');",
+        "if(typeof myFunction === \"function\") { capture(); myFunction(7,9); uncapture(); } assert(logOutput == 16, 'message: <code>myFunction(7,9)</code> should output <code>16</code>');",
         "assert(/^\\s*myFunction\\(\\s*\\d+\\s*,\\s*\\d+\\s*\\)\\s*;/m.test(code), 'message: Call <code>myFunction</code> after you define it');"
       ],
       "type": "waypoint",