Fix crash on repeated inject of invalid json payload

nodes/core/core/20-inject.html

@@ -172,7 +172,22 @@
         defaults: {
             name: {value:""},
             topic: {value:""},
-            payload: {value:""},
+            payload: {value:"", validate:function(v) {
+                var ptype = $("#node-input-payloadType").val() || this.payloadType;
+                if (ptype === 'json') {
+                    try {
+                        JSON.parse(v);
+                        return true;
+                    } catch(err) {
+                        return false;
+                    }
+                } else if (ptype === 'flow' || ptype === 'global' ) {
+                    return /^[a-zA-Z_][a-zA-Z0-9_]*(\.[a-zA-Z_][a-zA-Z0-9_]+)*/i.test(v);
+                } else if (ptype === 'num') {
+                    return /^[+-]?[0-9]*\.?[0-9]*([eE][-+]?[0-9]+)?$/.test(v);
+                }
+                return true;
+            }},
             payloadType: {value:"date"},
             repeat: {value:""},
             crontab: {value:""},

nodes/core/core/20-inject.js

@@ -50,7 +50,8 @@ module.exports = function(RED) {
         }
 
         this.on("input",function(msg) {
-            var msg = {topic:this.topic};
+            try {
+                msg = {topic:this.topic};
                 if ( (this.payloadType == null && this.payload === "") || this.payloadType === "date") {
                     msg.payload = Date.now();
                 } else if (this.payloadType == null) {
@@ -62,6 +63,9 @@ module.exports = function(RED) {
                 }
                 this.send(msg);
                 msg = null;
+            } catch(err) {
+                this.error(err,msg);
+            }
         });
     }