Added variadic workaround to troubleshooting guide

website/docs/guides/troubleshooting.mdx

@@ -24,4 +24,34 @@ If your built application looks like this in finder:
 
 it's likely that your application's `info.plist` is invalid. Update the file in `build/<yourapp>.app/Contents/info.plist`
 and check if the data is valid, EG check the binary name is correct. To persist the changes, copy the file back to
-the `build/darwin` directory.
+the `build/darwin` directory.
+
+## Cannot call backend method from frontend with variadic arguments
+
+If you have a backend method defined with variadic parameters, eg:
+```go
+func (a *App) TestFunc(msg string, args ...interface{}) error {
+    // Code
+}
+```
+calling this method from the frontend like this will fail:
+```js
+var msg = "Hello: "
+var args = ["Go", "JS"]
+window.go.main.App.TestFunc(msg, ...args).then((result) => {
+    //do things here
+}).catch((error) => {
+    //handle error
+});
+```
+Workaround:
+```js
+var msg = "Hello "
+var args = ["Go", "JS"]
+window.go.main.App.TestFunc(msg, args).then((result) => { //without the 3 dots
+    //do things here
+}).catch((error) => {
+    //handle error
+});
+```
+Credit: https://github.com/wailsapp/wails/issues/1186