diff --git a/src/Packagist/Api/Result/Factory.php b/src/Packagist/Api/Result/Factory.php
index 70787ff..da59913 100644
--- a/src/Packagist/Api/Result/Factory.php
+++ b/src/Packagist/Api/Result/Factory.php
@@ -148,7 +148,7 @@ public function createPackageResults(array $package): Package
                 }
             }
 
-            if ($version['source']) {
+            if ($version['source']??false) {
                 $version['source'] = $this->createResult(PackageSource::class, $version['source']);
             }