diff --git a/challenges/01-front-end-development-certification/basic-javascript.json b/challenges/01-front-end-development-certification/basic-javascript.json
index 2c7000056f..138effc5c1 100644
--- a/challenges/01-front-end-development-certification/basic-javascript.json
+++ b/challenges/01-front-end-development-certification/basic-javascript.json
@@ -4548,10 +4548,11 @@
         "(function(x) { return \"collection = \\n\" + JSON.stringify(x, '\\n', 2); })(collection);"
       ],
       "solutions": [
-        "var collection = {\n    2548: {\n      album: \"Slippery When Wet\",\n      artist: \"Bon Jovi\",\n      tracks: [ \n        \"Let It Rock\", \n        \"You Give Love a Bad Name\" \n      ]\n    },\n    2468: {\n      album: \"1999\",\n      artist: \"Prince\",\n      tracks: [ \n        \"1999\", \n        \"Little Red Corvette\" \n      ]\n    },\n    1245: {\n      artist: \"Robert Palmer\",\n      tracks: [ ]\n    },\n    5439: {\n      album: \"ABBA Gold\"\n    }\n};\n// Keep a copy of the collection for tests\nvar collectionCopy = JSON.parse(JSON.stringify(collection));\n\n// Only change code below this line\nfunction updateRecords(id, prop, value) {\n  if(value !== \"\") {\n    if(prop === \"tracks\") {\n      collection[id][prop].push(value);\n    } else {\n      collection[id][prop] = value;\n    }\n  } else {\n    delete collection[id][prop];\n  }\n\n  return collection;\n}"
+        "var collection = {\n    2548: {\n      album: \"Slippery When Wet\",\n      artist: \"Bon Jovi\",\n      tracks: [ \n        \"Let It Rock\", \n        \"You Give Love a Bad Name\" \n      ]\n    },\n    2468: {\n      album: \"1999\",\n      artist: \"Prince\",\n      tracks: [ \n        \"1999\", \n        \"Little Red Corvette\" \n      ]\n    },\n    1245: {\n      artist: \"Robert Palmer\",\n      tracks: [ ]\n    },\n    5439: {\n      album: \"ABBA Gold\"\n    }\n};\n// Keep a copy of the collection for tests\nvar collectionCopy = JSON.parse(JSON.stringify(collection));\n\n// Only change code below this line\nfunction updateRecords(id, prop, value) {\n  if(value !== \"\") {\n    if(prop === \"tracks\") {\n      collection[id][prop]= collection[id][prop] || [];\n collection[id][prop].push(value);\n    } else {\n      collection[id][prop] = value;\n    }\n  } else {\n    delete collection[id][prop];\n  }\n\n  return collection;\n}"
       ],
       "tests": [
         "collection = collectionCopy; assert(updateRecords(5439, \"artist\", \"ABBA\")[5439][\"artist\"] === \"ABBA\", 'message: After <code>updateRecords(5439, \"artist\", \"ABBA\")</code>, <code>artist</code> should be <code>\"ABBA\"</code>');",
+        "assert(updateRecords(5439, \"tracks\", \"Take a Chance on Me\")[5439][\"tracks\"].pop() === \"Take a Chance on Me\", 'message: After <code>updateRecords(5439, \"tracks\", \"Take a Chance on Me\")</code>, <code>tracks</code> should have <code>\"Take a Chance on Me\"</code> as the last element.');",
         "updateRecords(2548, \"artist\", \"\"); assert(!collection[2548].hasOwnProperty(\"artist\"), 'message: After <code>updateRecords(2548, \"artist\", \"\")</code>, <code>artist</code> should not be set');",
         "assert(updateRecords(1245, \"tracks\", \"Addicted to Love\")[1245][\"tracks\"].pop() === \"Addicted to Love\", 'message: After <code>updateRecords(1245, \"tracks\", \"Addicted to Love\")</code>, <code>tracks</code> should have <code>\"Addicted to Love\"</code> as the last element.');",
         "updateRecords(2548, \"tracks\", \"\"); assert(!collection[2548].hasOwnProperty(\"tracks\"), 'message: After <code>updateRecords(2548, \"tracks\", \"\")</code>, <code>tracks</code> should not be set');"