Check OS

Checks if the OS is OSX (Darwin) before executing the hook

scripts/after_plugin_add.js

@@ -2,14 +2,15 @@
 
 var iosHelper = require("./lib/ios-helper");
 var utilities = require("./lib/utilities");
+var os = require('os');
 
 module.exports = function(context) {
 
     var platforms = context.opts.cordova.platforms;
 
     // Add a build phase which runs a shell script that executes the Crashlytics
     // run command line tool which uploads the debug symbols at build time.
-    if (platforms.indexOf("ios") !== -1) {
+    if (platforms.indexOf("ios") !== -1 && os.platform() === 'darwin') {
         var xcodeProjectPath = utilities.getXcodeProjectPath(context);
         iosHelper.removeShellScriptBuildPhase(context, xcodeProjectPath);
         iosHelper.addShellScriptBuildPhase(context, xcodeProjectPath);