diff --git a/runtime/main/model/directive.ts b/runtime/main/model/directive.ts
index 39090186..6dd98023 100644
--- a/runtime/main/model/directive.ts
+++ b/runtime/main/model/directive.ts
@@ -184,10 +184,10 @@ export function bindSubVm(vm: Vm, rawSubVm: Vm, rawTemplate: TemplateInterface,
   const attr = template.attr || {};
   for (const key in attr) {
     const value = attr[key];
-    if (key === 'inhertClass') {
-      const inhertClasss = value.split(' ');
-      for (let x = 0; x < inhertClasss.length; x++) {
-        const cssName = '.' + inhertClasss[x];
+    if (key === 'inheritClass') {
+      const inheritClasses = value.split(' ');
+      for (let x = 0; x < inheritClasses.length; x++) {
+        const cssName = '.' + inheritClasses[x];
         const cssParent = vm._css[cssName];
         if (cssParent) {
           subVm._css[cssName] = cssParent;
diff --git a/runtime/main/model/index.ts b/runtime/main/model/index.ts
index 17e26852..a4e7f966 100644
--- a/runtime/main/model/index.ts
+++ b/runtime/main/model/index.ts
@@ -128,7 +128,7 @@ export default class Vm {
     const shareData = options.shareData || {};
     this.__vmOptions = options;
     this.__computed = options.computed;
-    this.__css = options.style;
+    this.__css = options.style || {};
     this.__selector = selector(this.__css);
     this.__ids = {};
     this.$refs = {};