Failed assertion: line 1702 pos 12: 'center!.parent == this': is not true - firebase

Question

What is the reason for getting the error?
And when I put the debug flag in the Streambuilder line, my application freezes before it comes to the main screen.
body: CustomScrollView(
slivers: [
StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance
.collection('posts')
.limit(10)
.orderBy('id', descending: true)
.snapshots(),
builder: (BuildContext context,
AsyncSnapshot<QuerySnapshot> dataSnapshot) {
return !dataSnapshot.hasData
? SliverToBoxAdapter(
child: linearProgress(),
)
: SliverStaggeredGrid.countBuilder(
crossAxisCount: 1,
staggeredTileBuilder: (val) => StaggeredTile.fit(1),
itemBuilder: (context, index) {
DataModel model = DataModel.fromJson(
dataSnapshot.data!.docs[index].data()
as Map<String, dynamic>);
return sourceInfo(model, context);
},
itemCount: dataSnapshot.data!.docs.length);
},
),
],
),
There was no problem when I imported the relevant codes into SliverPadding. Edited code.
StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance
.collection('posts')
.limit(10)
.orderBy('id', descending: true)
.snapshots(),
builder: (BuildContext context,
AsyncSnapshot<QuerySnapshot> dataSnapshot) {
return !dataSnapshot.hasData
? SliverPadding(
sliver: SliverToBoxAdapter(
child: ColorLoader(),
),
padding: EdgeInsets.all(0),
)
: SliverPadding(
sliver: SliverStaggeredGrid.countBuilder(
crossAxisCount: 1,
staggeredTileBuilder: (_) => StaggeredTile.fit(1),
itemBuilder: (context, index) {
DataModel model = DataModel.fromJson(
dataSnapshot.data!.docs[index].data()
as Map<String, dynamic>);
return sourceInfo(model, context);
},
itemCount: dataSnapshot.data!.docs.length),
padding: EdgeInsets.all(0),
);
},
),

Answer 1

According to this comment in a Github thread for a similar issue if the sliver being replaced is not the first it should work fine.
So a possible workaround is to add empty SliverToBoxAdapter() as first sliver before BodyContent().
There is more information and possible solutions in the Github thread, I recommend taking a look at it.