diff --git a/lib/datasource/packagist.js b/lib/datasource/packagist.js
index c2c2e3423a2856ed864bbc84e2bbb17fbaec6d31..b585bffccafe0b0a6e7eda9d852704ce768ea789 100644
--- a/lib/datasource/packagist.js
+++ b/lib/datasource/packagist.js
@@ -84,6 +84,7 @@ function extractDepReleases(versions) {
   const dep = {};
   // istanbul ignore if
   if (!versions) {
+    dep.releases = [];
     return dep;
   }
   dep.releases = Object.keys(versions)