From 80b070dc59b3c69bcd32e8b7259c8e0d7449a6cc Mon Sep 17 00:00:00 2001
From: Daniel Felten <daniel.felten@trimexa.de>
Date: Wed, 25 Nov 2020 09:37:53 +0100
Subject: [PATCH] Fix duration called on null for cupertino controls

---
 lib/src/cupertino_controls.dart | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/src/cupertino_controls.dart b/lib/src/cupertino_controls.dart
index 5b6f2a772..a9be42c70 100644
--- a/lib/src/cupertino_controls.dart
+++ b/lib/src/cupertino_controls.dart
@@ -221,7 +221,7 @@ class _CupertinoControlsState extends State<CupertinoControls> with SingleTicker
   }
 
   Expanded _buildHitArea() {
-    final bool isFinished = _latestValue.position >= _latestValue.duration;
+    final bool isFinished = _latestValue.duration != null && _latestValue.position >= _latestValue.duration;
 
     return Expanded(
       child: GestureDetector(