From f81d8bbc44760a1eb150d33020be7035b0f2a963 Mon Sep 17 00:00:00 2001
From: mohamed yahia <mohamedsalem401@yahoo.com>
Date: Fri, 25 Oct 2024 09:20:46 +0300
Subject: [PATCH] Throw an error if trying to access a data variable with
 undefined em

---
 packages/core/src/data_sources/model/DataVariable.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/packages/core/src/data_sources/model/DataVariable.ts b/packages/core/src/data_sources/model/DataVariable.ts
index a03e1d677..9e70b93b6 100644
--- a/packages/core/src/data_sources/model/DataVariable.ts
+++ b/packages/core/src/data_sources/model/DataVariable.ts
@@ -5,7 +5,7 @@ import { stringToPath } from '../../utils/mixins';
 export const DataVariableType = 'data-variable';
 
 export default class DataVariable extends Model {
-  em?: EditorModel;
+  em: EditorModel;
 
   defaults() {
     return {
@@ -37,7 +37,10 @@ export default class DataVariable extends Model {
 
   getDataValue() {
     const { path, defaultValue } = this.attributes;
-    const val = this.em?.DataSources.getValue(path, defaultValue);
+    if (!this.em) {
+      throw new Error('EditorModel instance is not provided for a data variable.');
+    }
+    const val = this.em.DataSources.getValue(path, defaultValue);
 
     return val;
   }