diff --git a/src/v0/destinations/sfmc/transform.js b/src/v0/destinations/sfmc/transform.js
index 879ca1989a..34630b2eda 100644
--- a/src/v0/destinations/sfmc/transform.js
+++ b/src/v0/destinations/sfmc/transform.js
@@ -224,16 +224,17 @@ const responseBuilderSimple = async (message, category, destination) => {
     throw new ConfigurationError('Creating or updating contacts is disabled');
   }
 
-  if (category.type === 'track' && hashMapExternalKey[message.event.toLowerCase()]) {
+  const lowerCasedEvent = message?.event?.toLowerCase();
+  if (category.type === 'track' && hashMapExternalKey[lowerCasedEvent]) {
     return responseBuilderForInsertData(
       message,
-      hashMapExternalKey[message.event.toLowerCase()],
+      hashMapExternalKey[lowerCasedEvent],
       subDomain,
       category,
       authToken,
       'track',
-      hashMapPrimaryKey[message.event.toLowerCase()] || CONTACT_KEY_KEY,
-      hashMapUUID[message.event.toLowerCase()],
+      hashMapPrimaryKey[lowerCasedEvent] || CONTACT_KEY_KEY,
+      hashMapUUID[lowerCasedEvent],
     );
   }
 
diff --git a/test/__tests__/data/sfmc_input.json b/test/__tests__/data/sfmc_input.json
index ee6eccb154..5050e8c214 100644
--- a/test/__tests__/data/sfmc_input.json
+++ b/test/__tests__/data/sfmc_input.json
@@ -993,5 +993,94 @@
       "Enabled": true,
       "Transformations": []
     }
+  },
+  {
+    "message": {
+      "context": {
+        "app": {
+          "build": "1.0.0",
+          "name": "RudderLabs JavaScript SDK",
+          "version": "1.0.0"
+        },
+        "campaign": {
+          "name": "Demo Campaign",
+          "source": "facebook",
+          "medium": "online",
+          "term": "Demo terms",
+          "content": "Demo content"
+        },
+        "traits": {
+          "email": "tonmoy@rudderstack.com",
+          "name": "Tonmoy Labs"
+        },
+        "library": {
+          "name": "RudderLabs JavaScript SDK",
+          "version": "1.0.0"
+        },
+        "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36",
+        "locale": "en-GB",
+        "ip": "0.0.0.0",
+        "screen": {
+          "density": 2,
+          "height": 860,
+          "width": 1280
+        }
+      },
+      "type": "track",
+      "messageId": "50360b9c-ea8d-409c-b672-c9230f91cce5",
+      "originalTimestamp": "2019-10-15T09:35:31.288Z",
+      "userId": "12345",
+      "properties": {
+        "Plan": "plan value",
+        "Price Key": 29.99,
+        "Contact Key": 12345,
+        "Guest Key": "2323-34343-3434"
+      },
+      "sentAt": "2019-10-14T09:03:22.563Z",
+      "integrations": {
+        "All": true
+      }
+    },
+    "destination": {
+      "ID": "1pYpzzvcn7AQ2W9GGIAZSsN6Mfq",
+      "Name": "SFMC",
+      "DestinationDefinition": {
+        "ID": "1pYpYSeQd8OeN6xPdw6VGDzqUd1",
+        "Name": "SFMC",
+        "DisplayName": "Salesforce Marketing Cloud",
+        "Config": {
+          "destConfig": [],
+          "excludeKeys": [],
+          "includeKeys": [],
+          "saveDestinationResponse": false,
+          "supportedSourceTypes": [],
+          "transformAt": "processor"
+        },
+        "ResponseRules": {}
+      },
+      "Config": {
+        "clientId": "vcn7AQ2W9GGIAZSsN6Mfq",
+        "clientSecret": "vcn7AQ2W9GGIAZSsN6Mfq",
+        "createOrUpdateContacts": false,
+        "eventDelivery": true,
+        "eventDeliveryTS": 1615371070621,
+        "eventToExternalKey": [
+          {
+            "from": "Event Name",
+            "to": "C500FD37-155C-49BD-A21B-AFCEF3D1A9CB"
+          },
+          { "from": "Watch", "to": "C500FD37-155C-49BD-A21B-AFCEF3D1A9CB" }
+        ],
+        "eventToPrimaryKey": [
+          { "from": "userId", "to": "User Key" },
+          { "from": "watch", "to": "Guest Key, Contact Key" }
+        ],
+        "eventToUUID": [{ "event": "Event Name", "uuid": true }],
+        "externalKey": "f3ffa19b-e0b3-4967-829f-549b781080e6",
+        "subDomain": "vcn7AQ2W9GGIAZSsN6Mfq"
+      },
+      "Enabled": true,
+      "Transformations": []
+    }
   }
 ]
diff --git a/test/__tests__/data/sfmc_output.json b/test/__tests__/data/sfmc_output.json
index 0271475e4a..404ac6dfb3 100644
--- a/test/__tests__/data/sfmc_output.json
+++ b/test/__tests__/data/sfmc_output.json
@@ -307,5 +307,8 @@
     },
     "version": "1",
     "endpoint": "https://vcn7AQ2W9GGIAZSsN6Mfq.rest.marketingcloudapis.com/hub/v1/dataevents/key:C500FD37-155C-49BD-A21B-AFCEF3D1A9CB/rows/Guest Key:2323-34343-3434,Contact Key:12345"
+  },
+  {
+    "error": "Event not mapped for this track call"
   }
 ]