diff --git a/lib/Page.js b/lib/Page.js
index 345d426ee0b..e4871717b97 100644
--- a/lib/Page.js
+++ b/lib/Page.js
@@ -97,7 +97,7 @@ class Page extends EventEmitter {
         // If we don't detach from service workers, they will never die.
         client.send('Target.detachFromTarget', {
           sessionId: event.sessionId
-        });
+        }).catch(debugError);
         return;
       }
       const session = client._createSession(event.targetInfo.targetId, event.sessionId);