diff --git a/src/Plugin.php b/src/Plugin.php
index 46603ae..8bf8a7c 100644
--- a/src/Plugin.php
+++ b/src/Plugin.php
@@ -20,6 +20,10 @@ public function activate(Composer $composer, IOInterface $io)
     {
         $package = $composer->getPackage();
 
+        if (!method_exists($package, 'setScripts')) {
+          return;
+        }
+
         $extractor = new PackageScriptsExtractor($io);
         $devScripts = $extractor->extract($package);