diff --git a/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js b/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
index 519753928..443f3844e 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
@@ -1085,6 +1085,13 @@ RED.editor = (function() {
                                     var input = $("#node-input-"+d);
                                     if (input.attr('type') === "checkbox") {
                                         newValue = input.prop('checked');
+                                    } else if (input.prop("nodeName") === "select" && input.attr("multiple") === "multiple") {
+                                        // An empty select-multiple box returns null.
+                                        // Need to treat that as an empty array.
+                                        newValue = input.val();
+                                        if (newValue == null) {
+                                            newValue = [];
+                                        }
                                     } else if ("format" in editing_node._def.defaults[d] && editing_node._def.defaults[d].format !== "" && input[0].nodeName === "DIV") {
                                         newValue = input.text();
                                     } else {