diff --git a/packages/node_modules/@node-red/editor-client/src/js/nodes.js b/packages/node_modules/@node-red/editor-client/src/js/nodes.js
index 61a5ae806..8beb9f9f4 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/nodes.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/nodes.js
@@ -1109,7 +1109,7 @@ RED.nodes = (function() {
                                     defaults: {},
                                     label: "unknown: "+n.type,
                                     labelStyle: "red-ui-flow-node-label-italic",
-                                    outputs: n.outputs||n.wires.length,
+                                    outputs: n.outputs|| (n.wires && n.wires.length) || 0,
                                     set: registry.getNodeSet("node-red/unknown")
                                 }
                             } else {