Error: The Ticker must be disposed before flutter: calling super.dispose

[kojima1981]

Describe the bug
I get the following error:

The following assertion was thrown while finalizing the widget tree:
_SidebarXState#9275a(ticker active) was disposed with an active Ticker.
_SidebarXState created a Ticker via its SingleTickerProviderStateMixin, but at the time dispose()
was called on the mixin, that Ticker was still active. The Ticker must be disposed before calling
super.dispose().
Tickers used by AnimationControllers should be disposed by calling dispose() on the
AnimationController itself. Otherwise, the ticker will leak.

Is it possible to fix it by changing the following:

class SidebarX extends StatefulWidget {

   /// Omit some code.... 

  @override
  void dispose() {
    _animationController.dispose();
    super.dispose();
  }
}