diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6bca95652..8933728ccf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [1.52.4](https://github.com/rudderlabs/rudder-transformer/compare/v1.52.3...v1.52.4) (2023-12-27)
+
+
+### Bug Fixes
+
+* send empty string instead of null when the schema data is undefined ([#2955](https://github.com/rudderlabs/rudder-transformer/issues/2955)) ([511741e](https://github.com/rudderlabs/rudder-transformer/commit/511741ed356b365f52e0335ce6a1fc953ccbc465))
+
 ### [1.52.3](https://github.com/rudderlabs/rudder-transformer/compare/v1.52.2...v1.52.3) (2023-12-18)
 
 
diff --git a/package-lock.json b/package-lock.json
index 573993a1a6..552802d3be 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "rudder-transformer",
-  "version": "1.52.3",
+  "version": "1.52.4",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "rudder-transformer",
-      "version": "1.52.3",
+      "version": "1.52.4",
       "license": "ISC",
       "dependencies": {
         "@amplitude/ua-parser-js": "^0.7.24",
diff --git a/package.json b/package.json
index e8259c96e6..b80b5be2c6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rudder-transformer",
-  "version": "1.52.3",
+  "version": "1.52.4",
   "description": "",
   "homepage": "https://github.com/rudderlabs/rudder-transformer#readme",
   "bugs": {
diff --git a/src/v0/destinations/fb_custom_audience/util.js b/src/v0/destinations/fb_custom_audience/util.js
index 47ccb9bf7d..6c53ed2814 100644
--- a/src/v0/destinations/fb_custom_audience/util.js
+++ b/src/v0/destinations/fb_custom_audience/util.js
@@ -131,21 +131,21 @@ const getUpdatedDataElement = (dataElement, isHashRequired, eachProperty, update
   /**
    * hash the original value for the properties apart from 'MADID' && 'EXTERN_ID as hashing is not required for them
    * ref: https://developers.facebook.com/docs/marketing-api/audiences/guides/custom-audiences#hash
-   * sending null values for the properties for which user hasn't provided any value
+   * sending empty string for the properties for which user hasn't provided any value
    */
   if (isHashRequired && eachProperty !== 'MADID' && eachProperty !== 'EXTERN_ID') {
     if (tmpUpdatedProperty) {
       tmpUpdatedProperty = `${tmpUpdatedProperty}`;
       dataElement.push(sha256(tmpUpdatedProperty));
     } else {
-      dataElement.push(null);
+      dataElement.push('');
     }
   }
-  // if property name is MADID or EXTERN_ID if the value is undefined send null
+  // if property name is MADID or EXTERN_ID if the value is undefined send empty string
   else if (!tmpUpdatedProperty && (eachProperty === 'MADID' || eachProperty === 'EXTERN_ID')) {
-    dataElement.push(null);
+    dataElement.push('');
   } else {
-    dataElement.push(tmpUpdatedProperty);
+    dataElement.push(tmpUpdatedProperty || '');
   }
   return dataElement;
 };
diff --git a/test/integrations/destinations/fb_custom_audience/processor/data.ts b/test/integrations/destinations/fb_custom_audience/processor/data.ts
index 4f892f6fef..267b966865 100644
--- a/test/integrations/destinations/fb_custom_audience/processor/data.ts
+++ b/test/integrations/destinations/fb_custom_audience/processor/data.ts
@@ -1987,7 +1987,7 @@ export const data = [
                       'a953f09a1b6b6725b81956e9ad0b1eb49e3ad40004c04307ef8af6246a054116',
                       '3fdba35f04dc8c462986c992bcf875546257113072a909c162f7e470e581e278',
                       '7931aa2a1bed855457d1ddf6bc06ab4406a9fba0579045a4d6ff78f9c07c440f',
-                      null,
+                      '',
                       '252f10c83610ebca1a059c0bae8255eba2f95be4d1d7bcfa89d7248a82d9f111',
                       'db0683221aebc02cc034b65ebcf7d1bddd1eb199e33fd23a31931947d13a11bc',
                       'abc',
@@ -2123,7 +2123,7 @@ export const data = [
                     'ST',
                     'COUNTRY',
                   ],
-                  data: [[null, null, null, null, null, null, null, null, null, null, null]],
+                  data: [['', '', '', '', '', '', '', '', '', '', '']],
                 },
               },
               body: {
@@ -2256,7 +2256,7 @@ export const data = [
                       'a953f09a1b6b6725b81956e9ad0b1eb49e3ad40004c04307ef8af6246a054116',
                       '3fdba35f04dc8c462986c992bcf875546257113072a909c162f7e470e581e278',
                       '7931aa2a1bed855457d1ddf6bc06ab4406a9fba0579045a4d6ff78f9c07c440f',
-                      null,
+                      '',
                       '252f10c83610ebca1a059c0bae8255eba2f95be4d1d7bcfa89d7248a82d9f111',
                       'db0683221aebc02cc034b65ebcf7d1bddd1eb199e33fd23a31931947d13a11bc',
                       'abc',
diff --git a/test/integrations/destinations/fb_custom_audience/router/data.ts b/test/integrations/destinations/fb_custom_audience/router/data.ts
index efefb80a89..fd099fe33c 100644
--- a/test/integrations/destinations/fb_custom_audience/router/data.ts
+++ b/test/integrations/destinations/fb_custom_audience/router/data.ts
@@ -26757,16 +26757,16 @@ export const data = [
                     payload: {
                       schema: ['EMAIL', 'FN'],
                       data: [
-                        ['7625cab24612c37df6d2f724721bb38a25095d0295e29b807238ee188b8aca43', null],
-                        ['b2b4abadd72190af54305c0d3abf1977fec4935016bb13ff28040d5712318dfd', null],
-                        ['c4b007d1c3c9a5d31bd4082237a913e8e0db1767225c2a5ef33be2716df005fa', null],
-                        ['94639be1bd9f17c05820164e9d71ef78558f117a9e8bfab43cf8015e08aa0b27', null],
-                        ['39b456cfb4bb07f9e6bb18698aa173171ca49c731fccc4790e9ecea808d24ae6', null],
-                        ['769f73387add781a481ca08300008a08fb2f1816aaed196137efc2e05976d711', null],
-                        ['48ddb93f0b30c475423fe177832912c5bcdce3cc72872f8051627967ef278e08', null],
-                        ['da2d431121cd10578fd81f8f80344b06db59ea2d05a7b5d27536c8789ddae8f0', null],
-                        ['b100c2ec0718fe6b4805b623aeec6710719d042ceea55f5c8135b010ec1c7b36', null],
-                        ['0c1d1b0ba547a742013366d6fbc8f71dd77f566d94e41ed9f828a74b96928161', null],
+                        ['7625cab24612c37df6d2f724721bb38a25095d0295e29b807238ee188b8aca43', ''],
+                        ['b2b4abadd72190af54305c0d3abf1977fec4935016bb13ff28040d5712318dfd', ''],
+                        ['c4b007d1c3c9a5d31bd4082237a913e8e0db1767225c2a5ef33be2716df005fa', ''],
+                        ['94639be1bd9f17c05820164e9d71ef78558f117a9e8bfab43cf8015e08aa0b27', ''],
+                        ['39b456cfb4bb07f9e6bb18698aa173171ca49c731fccc4790e9ecea808d24ae6', ''],
+                        ['769f73387add781a481ca08300008a08fb2f1816aaed196137efc2e05976d711', ''],
+                        ['48ddb93f0b30c475423fe177832912c5bcdce3cc72872f8051627967ef278e08', ''],
+                        ['da2d431121cd10578fd81f8f80344b06db59ea2d05a7b5d27536c8789ddae8f0', ''],
+                        ['b100c2ec0718fe6b4805b623aeec6710719d042ceea55f5c8135b010ec1c7b36', ''],
+                        ['0c1d1b0ba547a742013366d6fbc8f71dd77f566d94e41ed9f828a74b96928161', ''],
                       ],
                     },
                   },