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 e44a90dc6..2a6a7af18 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
@@ -846,7 +846,10 @@
         },
         value: function(value) {
             var that = this;
-            var opt = this.typeMap[this.propertyType];
+            // If the default type has been set to an invalid type, then on first
+            // creation, the current propertyType will not exist. Default to an
+            // empty object on the assumption the corrent type will be set shortly
+            var opt = this.typeMap[this.propertyType] || {};
             if (!arguments.length) {
                 var v = this.input.val();
                 if (opt.export) {
diff --git a/packages/node_modules/@node-red/nodes/core/common/20-inject.html b/packages/node_modules/@node-red/nodes/core/common/20-inject.html
index bd17e1635..73dd7fe40 100644
--- a/packages/node_modules/@node-red/nodes/core/common/20-inject.html
+++ b/packages/node_modules/@node-red/nodes/core/common/20-inject.html
@@ -539,7 +539,7 @@
                     var propertyValue = $('<input/>',{class:"node-input-prop-property-value",type:"text"})
                         .css("width","calc(70% - 30px)")
                         .appendTo(row)
-                        .typedInput({default:prop.vt,types:['flow','global','str','num','bool','json','bin','date','jsonata','env','msg']});
+                        .typedInput({default:prop.vt || 'str',types:['flow','global','str','num','bool','json','bin','date','jsonata','env','msg']});
 
                     propertyName.typedInput('value',prop.p);
                     propertyValue.typedInput('value',prop.v);
@@ -562,7 +562,7 @@
                 var topic = {
                     p:'topic',
                     v: node.topic ? node.topic : '',
-                    vt:'string'
+                    vt:'str'
                 }
                 node.props = [payload,topic];
             }
@@ -578,6 +578,11 @@
                         newProp.v =  node.topic ? node.topic : '';
                     }
                 }
+                if (newProp.vt === "string") {
+                    // Fix bug in pre 2.1 where an old Inject node might have
+                    // a migrated rule with type 'string' not 'str'
+                    newProp.vt = "str";
+                }
                 eList.editableList('addItem',newProp);
             }