Arguments not getting passed, on opening application from browser using custom scheme url mac

Requirement : Need to run an Adobe AIR captive runtime application from browser in mac.
After creating application have added CFBundleURLTypes tag in Info.plist

<key>CFBundleURLTypes</key>
            <array>
            <dict>
                <key>CFBundleURLName</key>
                <string>com.test.helloworld</string>
                <key>CFBundleURLSchemes</key>
                <array>
                <string>testapp</string>
                </array>
            </dict>
            </array>

Then opening the application once to register CFBundleURLTypes in mac os.

Then, when I open this url in browser testapp://login?user123&pass=abc application gets opened but argument is not passed.

window.runtime.flash.desktop.NativeApplication.nativeApplication.addEventListener(window.runtime.flash.events.InvokeEvent.INVOKE, function (event) {
alert("event.arguments="+event.arguments);

If I don't not close this application and open the url testapp://login?user123&pass=abc again then application's InvokeEvent.INVOKE event is triggered again and parameters is passed

Why this argument is not getting passed first time?