Vue: v1.0.18 - Cannot convert undefined or null to object

[b12k]

Hi there!

After and upgrade to latest version v1.0.18 I getting an
Uncaught TypeError: Cannot convert undefined or null to object

I did a roll back to v1.0.17 - and it works well.

Chrome devtools says that error is on var keys = Object.keys(data); line:

/**
       * Initialize the data.
       */

      Vue.prototype._initData = function () {
        var dataFn = this.$options.data;
        var data = this._data = dataFn ? dataFn() : {};
        var props = this._props;
        var runtimeData = this._runtimeData ? typeof this._runtimeData === 'function' ? this._runtimeData() : this._runtimeData : null;
        // proxy data on instance
        var keys = Object.keys(data);
        var i, key;
        i = keys.length;
        while (i--) {
          key = keys[i];
          // there are two scenarios where we can proxy a data key:
          // 1. it's not already defined as a prop
          // 2. it's provided via a instantiation option AND there are no
          //    template prop present
          if (!props || !hasOwn(props, key) || runtimeData && hasOwn(runtimeData, key) && props[key].raw === null) {
            this._proxy(key);
          } else if (process.env.NODE_ENV !== 'production') {
            warn('Data field "' + key + '" is already defined ' + 'as a prop. Use prop default value instead.');
          }
        }
        // observe data
        observe(data, this);
      };

Here is a screenshot of the console: http://prntscr.com/ai19zx

Thank you!

[phanan]

Can you paste the data attribute of your component options?

[simplesmiler]

It looks like some of your data functions do not return, or return null.

This was already fixed and will land in the next release: https://github.com/vuejs/vue/commit/b80ae34b9c58f1a3979008b03512c8dd70d94952. In the mean time you can keep using 1.0.17 or make sure your data functions return an object.