diff --git a/src/Utils/Version.php b/src/Utils/Version.php
index 5c31631..a3fb83b 100644
--- a/src/Utils/Version.php
+++ b/src/Utils/Version.php
@@ -46,7 +46,7 @@ public function findBestCandidate(Composer $composer, string $packageName, Repos
             $bestCandidate = $this->findBestCandidateComposer2($composer, $packageName, $repository);
         }
 
-        if($bestCandidate instanceof PackageInterface){
+        if (isset($bestCandidate) && $bestCandidate instanceof PackageInterface) {
             return $bestCandidate;
         }
         return null;