Fix double request on load

Author: cletusw

loader.js

@@ -113,7 +113,8 @@ module.exports.pitch = function(request) {
 						if (text.locals) {
 							resultSource += "\nmodule.exports = " + JSON.stringify(text.locals) + ";";
 						}
-						resultSource += "\nif(module.hot){\nmodule.hot.accept();\nrequire('" + extractTextPluginHmrRuntime + "')('%%extracted-hash%%','" + publicPath + "','%%extracted-file%%');}";
+						// module.hot.data is undefined on initial load, and an object in hot updates
+						resultSource += "\nif(module.hot){\nmodule.hot.accept();\nif(module.hot.data){\nrequire('" + extractTextPluginHmrRuntime + "')('%%extracted-hash%%','" + publicPath + "','%%extracted-file%%');\n}\n}";
 					}
 				} catch(e) {
 					return callback(e);