diff --git a/lib/core-pool.js b/lib/core-pool.js
index 70e537fb..df2c9eb4 100644
--- a/lib/core-pool.js
+++ b/lib/core-pool.js
@@ -12,10 +12,10 @@ module.exports = class CorePool {
 
   linger (core) {
     const hex = b4a.toString(core.key, 'hex')
-    const session = core.session()
-
     if (this.pool.has(hex)) return
 
+    const session = core.session()
+
     const wrap = {
       session,
       timeout: setTimeout(ontimeout, LINGER_TIME, this, session)