diff --git a/keyserver/src/socket/socket.js b/keyserver/src/socket/socket.js
--- a/keyserver/src/socket/socket.js
+++ b/keyserver/src/socket/socket.js
@@ -407,6 +407,11 @@
     }
 
     const compressionResult = await compressMessage(stringMessage);
+
+    if (this.ws.readyState !== 1) {
+      return;
+    }
+
     if (!compressionResult.compressed) {
       this.ws.send(stringMessage);
       return;