diff --git a/packages/node_modules/@node-red/editor-client/src/js/ui/view.js b/packages/node_modules/@node-red/editor-client/src/js/ui/view.js
index b2d2b11b1..417aa7c11 100755
--- a/packages/node_modules/@node-red/editor-client/src/js/ui/view.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/ui/view.js
@@ -2918,7 +2918,7 @@ RED.view = (function() {
                     } else if (drag_line.portType === PORT_TYPE_INPUT) {
                         src = mouseup_node;
                         dst = drag_line.node;
-                        src_port = portIndex;
+                        src_port = portIndex || 0;
                     }
                     var link = {source: src, sourcePort:src_port, target: dst};
                     if (drag_line.virtualLink) {