auto-submit · Aug 19, 2025 · Aug 6, 2025 · Aug 6, 2025 · Aug 6, 2025 · Aug 6, 2025
diff --git a/packages/flutter/lib/src/rendering/stack.dart b/packages/flutter/lib/src/rendering/stack.dart
@@ -660,7 +660,15 @@ class RenderStack extends RenderBox
       size = constraints.biggest;
     }
 
-    assert(size.isFinite);
+    assert(
+      size.isFinite,
+      'A Stack requires bounded constraints from its parent. '
+      'This error commonly occurs when a Stack is placed inside a widget like Column, '
+      'ListView, or other widgets that do not constrain their children. '
+      'To fix this, wrap the Stack in a widget that provides finite height and width constraints, '
+      'such as a SizedBox or ConstrainedBox. '
+      'Use Expanded only if the parent is a Flex widget like Row or Column.',
+    );
     return size;
   }