diff --git a/lib/connection.ts b/lib/connection.ts
index b73bea73..4984c913 100644
--- a/lib/connection.ts
+++ b/lib/connection.ts
@@ -374,7 +374,16 @@ export class Connection {
             console.warn(
               `Received event for unknown subscription ${message.id}. Unsubscribing.`,
             );
-            this.sendMessagePromise(messages.unsubscribeEvents(message.id));
+            this.sendMessagePromise(
+              messages.unsubscribeEvents(message.id),
+            ).catch((err) => {
+              if (DEBUG) {
+                console.warn(
+                  ` Error unsubsribing from unknown subscription ${message.id}`,
+                  err,
+                );
+              }
+            });
           }
           break;