diff --git a/packages/node_modules/@node-red/editor-client/src/js/ui/common/typedInput.js b/packages/node_modules/@node-red/editor-client/src/js/ui/common/typedInput.js
index 3249a5cbb..9092d4dcf 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/ui/common/typedInput.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/ui/common/typedInput.js
@@ -923,7 +923,7 @@
                     var previousType = this.typeMap[this.propertyType];
                     previousValue = this.input.val();
 
-                    if (this.typeChanged) {
+                    if (previousType && this.typeChanged) {
                         if (this.options.debug) { console.log(this.identifier,"typeChanged",{previousType,previousValue}) }
                         if (previousType.options && opt.hasValue !== true) {
                             this.oldValues[previousType.value] = previousValue;