Merge pull request #93 from jangidgirish/master

bug fixed add initial field in create mode

Author: yassilah

dist/js/field.js

@@ -30,7 +30,10 @@ export default {
      * Add a new child.
      */
     addChild() {
-      const maxKey = this.field.children[this.field.children.length - 1].key || Math.max.apply(Math, this.field.children.map(({ id }) => id));
+      let maxKey = 0;
+      if(this.field.children.length){
+        maxKey = this.field.children[this.field.children.length - 1].key || Math.max.apply(Math, this.field.children.map(({ id }) => id));
+      }
       this.field.schema.key = maxKey + 1;
       this.field.children.push(this.replaceIndexesInSchema(this.field));
     },
@@ -81,4 +84,4 @@ export default {
     }
   }
 }
-</script>
+</script>