Wait for chmod completion

electron.js

@@ -524,11 +524,23 @@ ipcMain.on(Constants.IPC_Extract_Release, (event, data) => {
     .on('finish', () => {
       stream.close();
       if (os.platform() !== 'win32') {
-        helpers.executeAndWait("chmod +x \"" + path.join(destination, 'repertory') + "\"");
+        helpers
+          .executeAndWait("chmod +x \"" + path.join(destination, 'repertory') + "\"")
+          .then(() => {
+            standardIPCReply(event, Constants.IPC_Extract_Release_Complete, {
+              Source: data.Source,
+            });
+          })
+          .catch(error => {
+            standardIPCReply(event, Constants.IPC_Extract_Release_Complete, {
+              Source: data.Source,
+            }, error);
+        })
+      } else {
+        standardIPCReply(event, Constants.IPC_Extract_Release_Complete, {
+          Source: data.Source,
+        });
       }
-      standardIPCReply(event, Constants.IPC_Extract_Release_Complete, {
-        Source: data.Source,
-      });
     });
 });