diff --git a/packages/node_modules/@node-red/editor-api/lib/editor/comms.js b/packages/node_modules/@node-red/editor-api/lib/editor/comms.js
index 45b5f372a..d50f74195 100644
--- a/packages/node_modules/@node-red/editor-api/lib/editor/comms.js
+++ b/packages/node_modules/@node-red/editor-api/lib/editor/comms.js
@@ -314,6 +314,8 @@ function addActiveConnection(connection) {
     runtimeAPI.comms.addConnection({client: connection});
 }
 function removeActiveConnection(connection) {
+    // Clear pending messages.
+    connection.stack = []
     for (var i=0;i<activeConnections.length;i++) {
         if (activeConnections[i] === connection) {
             activeConnections.splice(i,1);