diff --git a/danger-kotlin-library/src/main/kotlin/systems/danger/kotlin/models/github/GitHub.kt b/danger-kotlin-library/src/main/kotlin/systems/danger/kotlin/models/github/GitHub.kt
index 8827d06..1b2ad80 100644
--- a/danger-kotlin-library/src/main/kotlin/systems/danger/kotlin/models/github/GitHub.kt
+++ b/danger-kotlin-library/src/main/kotlin/systems/danger/kotlin/models/github/GitHub.kt
@@ -299,7 +299,7 @@ data class GitHubUser(
     val login: String? = null,
     val type: GitHubUserType? = null,
     @SerialName("avatar_url")
-    val avatarUrl: String?
+    val avatarUrl: String? = null
 )
 
 @Serializable