diff --git a/src/index.ts b/src/index.ts
index a3419a4..b61e63b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -11,6 +11,6 @@ createActionsPlugin<PluginSettings, Env, SupportedEvents>(
     envSchema: envSchema,
     settingsSchema: pluginSettingsSchema,
     logLevel: process.env.LOG_LEVEL || LOG_LEVEL.INFO,
-    kernelPublicKey: process.env.KERNEL_PUBLIC_KEY,
+    ...(process.env.KERNEL_PUBLIC_KEY && { kernelPublicKey: process.env.KERNEL_PUBLIC_KEY }),
   }
 ).catch(console.error);