diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d10a329..7f440135 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file. Dates are d
 
 Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 
+### [1.24.2](https://github.com/eea/volto-eea-website-theme/compare/1.24.1...1.24.2) - 4 December 2023
+
+#### :bug: Bug Fixes
+
+- fix: check if schema has properties.data - refs #261239 [dobri1408 - [`b2a5faf`](https://github.com/eea/volto-eea-website-theme/commit/b2a5fafa8e41a4ea2d5124f8f6cd3e6bbd276a21)]
+
 ### [1.24.1](https://github.com/eea/volto-eea-website-theme/compare/1.24.0...1.24.1) - 27 November 2023
 
 #### :nail_care: Enhancements
diff --git a/package.json b/package.json
index f77e67c6..f265c78c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eeacms/volto-eea-website-theme",
-  "version": "1.24.1",
+  "version": "1.24.2",
   "description": "@eeacms/volto-eea-website-theme: Volto add-on",
   "main": "src/index.js",
   "author": "European Environment Agency: IDM2 A-Team",
diff --git a/src/index.js b/src/index.js
index 0c03dddf..e9152351 100644
--- a/src/index.js
+++ b/src/index.js
@@ -67,6 +67,15 @@ function tabVariationCustomization(tabs_block_variations, config) {
     const schema = (oldSchemaEnhancer ? oldSchemaEnhancer(props) : props)
       .schema;
     const oldSchemaExtender = schema.properties?.data?.schemaExtender;
+
+    //check before if schema.properties.data exists
+    if (!schema?.properties?.data) {
+      schema.properties = {
+        ...schema.properties,
+        data: {},
+      };
+    }
+
     schema.properties.data.schemaExtender = (schema, child) => {
       const innerSchema = oldSchemaExtender
         ? oldSchemaExtender(schema, child)