diff --git a/src/Issue/Reporter.php b/src/Issue/Reporter.php
index e4d5020f..c639118b 100644
--- a/src/Issue/Reporter.php
+++ b/src/Issue/Reporter.php
@@ -16,7 +16,7 @@ class Reporter implements \JsonSerializable
 
     public ?string $name;
 
-    public ?string $emailAddress;
+    public ?string $emailAddress = null;
 
     public array $avatarUrls;
 
diff --git a/test-data/reporter-no-email-address.json b/test-data/reporter-no-email-address.json
new file mode 100644
index 00000000..b3a05a60
--- /dev/null
+++ b/test-data/reporter-no-email-address.json
@@ -0,0 +1,16 @@
+{
+    "reporter": {
+        "self": "https://jira.example.com/rest/api/2/user?username=lesstif",
+        "name": "lesstif",
+        "key": "lesstif",
+        "avatarUrls": {
+            "48x48": "https://secure.gravatar.com/avatar/9f1705ef1d8c977eba04f00556e02922?d=mm&s=48",
+            "24x24": "https://secure.gravatar.com/avatar/9f1705ef1d8c977eba04f00556e02922?d=mm&s=24",
+            "16x16": "https://secure.gravatar.com/avatar/9f1705ef1d8c977eba04f00556e02922?d=mm&s=16",
+            "32x32": "https://secure.gravatar.com/avatar/9f1705ef1d8c977eba04f00556e02922?d=mm&s=32"
+        },
+        "displayName": "정광섭",
+        "active": true,
+        "timeZone": "Asia/Seoul"
+    }
+}
\ No newline at end of file
diff --git a/tests/MapperTest.php b/tests/MapperTest.php
index a74b5e43..49d02452 100644
--- a/tests/MapperTest.php
+++ b/tests/MapperTest.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace JiraRestApi\Test;
 
@@ -89,4 +89,17 @@ public function testIssue()
 
     }
 
+    public function testReporterField()
+    {
+        $ret = file_get_contents('test-data/reporter-no-email-address.json');
+
+        $reporter = $this->mapper->map(
+            json_decode($ret), new Reporter()
+        );
+
+        $this->assertInstanceOf(Reporter::class, $reporter);
+
+        $this->assertEquals('lesstif@gmail.com', $reporter->emailAddress);
+    }
+
 }