fix: Vue plugin doesnt explode if vm is undefined (#1111)

Author: kamilogorek

plugins/vue.js

@@ -22,20 +22,22 @@ function vuePlugin(Raven, Vue) {
 
   var _oldOnError = Vue.config.errorHandler;
   Vue.config.errorHandler = function VueErrorHandler(error, vm, info) {
-    var metaData = {
-      componentName: formatComponentName(vm),
-      propsData: vm.$options.propsData
-    };
-
-    // lifecycleHook is not always available
-    if (typeof info !== 'undefined') {
-      metaData.lifecycleHook = info;
+    if (Object.prototype.toString.call(vm) === '[object Object]') {
+      var metaData = {
+        componentName: formatComponentName(vm),
+        propsData: vm.$options.propsData
+      };
+
+      // lifecycleHook is not always available
+      if (typeof info !== 'undefined') {
+        metaData.lifecycleHook = info;
+      }
+
+      Raven.captureException(error, {
+        extra: metaData
+      });
     }
 
-    Raven.captureException(error, {
-      extra: metaData
-    });
-
     if (typeof _oldOnError === 'function') {
       _oldOnError.call(this, error, vm, info);
     }

test/plugins/vue.test.js

@@ -75,5 +75,14 @@ describe('Vue plugin', function() {
         lifecycleHook: 'mounted'
       });
     });
+
+    it('should not explode when `vm` is not defined', function() {
+      vuePlugin(Raven, this.MockVue);
+      assert.doesNotThrow(
+        function() {
+          this.MockVue.config.errorHandler(new Error('foo'));
+        }.bind(this)
+      );
+    });
   });
 });