diff --git a/CHANGES.md b/CHANGES.md
index 39465ca8d4..2a38afd407 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,7 +1,8 @@
 # Version 1.0.2
 ## Bugs
-- Fixed default value for creating Boolean Attribute [#4040](https://github.com/appwrite/appwrite/pull/404)
+- Fixed nullable values in functions variables [#3885](https://github.com/appwrite/appwrite/pull/3885)
 - Fixed migration for audit by migrating the `time` attribute [#4038](https://github.com/appwrite/appwrite/pull/4038)
+- Fixed default value for creating Boolean Attribute [#4040](https://github.com/appwrite/appwrite/pull/4040)
 - Fixed phone authentication code to be hashed in the internal database [#3906](https://github.com/appwrite/appwrite/pull/3906)
 
 # Version 1.0.1
diff --git a/app/controllers/api/functions.php b/app/controllers/api/functions.php
index 55dee2de98..d3a26b414e 100644
--- a/app/controllers/api/functions.php
+++ b/app/controllers/api/functions.php
@@ -1127,21 +1127,21 @@ App::post('/v1/functions/:functionId/executions')
         }
 
         $vars = array_reduce($function['vars'] ?? [], function (array $carry, Document $var) {
-            $carry[$var->getAttribute('key')] = $var->getAttribute('value');
+            $carry[$var->getAttribute('key')] = $var->getAttribute('value') ?? '';
             return $carry;
         }, []);
 
         $vars = \array_merge($vars, [
             'APPWRITE_FUNCTION_ID' => $function->getId(),
-            'APPWRITE_FUNCTION_NAME' => $function->getAttribute('name', ''),
+            'APPWRITE_FUNCTION_NAME' => $function->getAttribute('name'),
             'APPWRITE_FUNCTION_DEPLOYMENT' => $deployment->getId(),
-            'APPWRITE_FUNCTION_TRIGGER' => 'http',
-            'APPWRITE_FUNCTION_RUNTIME_NAME' => $runtime['name'],
-            'APPWRITE_FUNCTION_RUNTIME_VERSION' => $runtime['version'],
-            'APPWRITE_FUNCTION_DATA' => $data,
             'APPWRITE_FUNCTION_PROJECT_ID' => $project->getId(),
-            'APPWRITE_FUNCTION_USER_ID' => $user->getId(),
-            'APPWRITE_FUNCTION_JWT' => $jwt,
+            'APPWRITE_FUNCTION_TRIGGER' => 'http',
+            'APPWRITE_FUNCTION_RUNTIME_NAME' => $runtime['name'] ?? '',
+            'APPWRITE_FUNCTION_RUNTIME_VERSION' => $runtime['version'] ?? '',
+            'APPWRITE_FUNCTION_DATA' => $data ?? '',
+            'APPWRITE_FUNCTION_USER_ID' => $user->getId() ?? '',
+            'APPWRITE_FUNCTION_JWT' => $jwt ?? '',
         ]);
 
         /** Execute function */
diff --git a/app/workers/functions.php b/app/workers/functions.php
index 31b74a11ca..1df776383f 100644
--- a/app/workers/functions.php
+++ b/app/workers/functions.php
@@ -271,17 +271,17 @@ class FunctionsV1 extends Worker
         /** Collect environment variables */
         $vars = \array_merge($vars, [
             'APPWRITE_FUNCTION_ID' => $functionId,
-            'APPWRITE_FUNCTION_NAME' => $function->getAttribute('name', ''),
+            'APPWRITE_FUNCTION_NAME' => $function->getAttribute('name'),
             'APPWRITE_FUNCTION_DEPLOYMENT' => $deploymentId,
-            'APPWRITE_FUNCTION_RUNTIME_NAME' => $runtime['name'],
-            'APPWRITE_FUNCTION_RUNTIME_VERSION' => $runtime['version'],
             'APPWRITE_FUNCTION_TRIGGER' => $trigger,
-            'APPWRITE_FUNCTION_EVENT' => $event,
-            'APPWRITE_FUNCTION_EVENT_DATA' => $eventData,
-            'APPWRITE_FUNCTION_DATA' => $data,
             'APPWRITE_FUNCTION_PROJECT_ID' => $project->getId(),
-            'APPWRITE_FUNCTION_USER_ID' => $user->getId(),
-            'APPWRITE_FUNCTION_JWT' => $jwt,
+            'APPWRITE_FUNCTION_RUNTIME_NAME' => $runtime['name'] ?? '',
+            'APPWRITE_FUNCTION_RUNTIME_VERSION' => $runtime['version'] ?? '',
+            'APPWRITE_FUNCTION_EVENT' => $event ?? '',
+            'APPWRITE_FUNCTION_EVENT_DATA' => $eventData ?? '',
+            'APPWRITE_FUNCTION_DATA' => $data ?? '',
+            'APPWRITE_FUNCTION_USER_ID' => $user->getId() ?? '',
+            'APPWRITE_FUNCTION_JWT' => $jwt ?? '',
         ]);
 
         /** Execute function */