diff --git a/lib/models/auth.dart b/lib/models/auth.dart
index 8d1ce3ef..0d92289e 100644
--- a/lib/models/auth.dart
+++ b/lib/models/auth.dart
@@ -208,15 +208,16 @@ class AuthModel with ChangeNotifier {
     final res = await http.get(Uri.parse('${activeAccount!.domain}/api/v4$p'),
         headers: {'Private-Token': token});
     final next = int.tryParse(
-        res.headers['X-Next-Pages'] ?? res.headers['x-next-page'] ?? '')!;
+        res.headers['X-Next-Pages'] ?? res.headers['x-next-page'] ?? '');
     final info = json.decode(utf8.decode(res.bodyBytes));
     if (info is Map && info['message'] != null) throw info['message'];
     return DataWithPage(
       data: info,
-      cursor: next,
+      cursor: next ?? 1,
       hasMore: next != null,
-      total:
-          int.tryParse(res.headers['X-Total'] ?? res.headers['x-total'] ?? '')!,
+      total: int.tryParse(
+              res.headers['X-Total'] ?? res.headers['x-total'] ?? '') ??
+          TOTAL_COUNT_FALLBACK,
     );
   }
 
@@ -318,7 +319,8 @@ class AuthModel with ChangeNotifier {
       data: info,
       cursor: page + 1,
       hasMore: info is List && info.length > 0,
-      total: int.tryParse(res.headers['x-total-count'] ?? '')!,
+      total: int.tryParse(res.headers['x-total-count'] ?? '') ??
+          TOTAL_COUNT_FALLBACK,
     );
   }
 
@@ -421,7 +423,8 @@ class AuthModel with ChangeNotifier {
       data: info,
       cursor: page + 1,
       hasMore: info is List && info.length > 0,
-      total: int.tryParse(res.headers['x-total-count'] ?? '')!,
+      total: int.tryParse(res.headers['x-total-count'] ?? '') ??
+          TOTAL_COUNT_FALLBACK,
     );
   }
 
@@ -504,7 +507,8 @@ class AuthModel with ChangeNotifier {
     final info = json.decode(utf8.decode(res.bodyBytes));
 
     final totalPage = int.tryParse(res.headers['total_page'] ?? '');
-    final totalCount = int.tryParse(res.headers['total_count'] ?? '')!;
+    final totalCount =
+        int.tryParse(res.headers['total_count'] ?? '') ?? TOTAL_COUNT_FALLBACK;
 
     return DataWithPage(
       data: info,
@@ -584,7 +588,7 @@ class AuthModel with ChangeNotifier {
     final v = BbPagination.fromJson(data);
     return BbPagePayload(
       cursor: v.next,
-      total: v.size!,
+      total: v.size ?? TOTAL_COUNT_FALLBACK,
       data: v.values,
       hasMore: v.next != null,
     );
diff --git a/lib/screens/bb_user.dart b/lib/screens/bb_user.dart
index d0197a2e..b40a640b 100644
--- a/lib/screens/bb_user.dart
+++ b/lib/screens/bb_user.dart
@@ -34,10 +34,7 @@ class BbUserScreen extends StatelessWidget {
         ]);
         return Tuple2(
           BbUser.fromJson(res[0]),
-          [
-            for (var v in (res[1] as BbPagePayload<List>).data)
-              BbRepo.fromJson(v)
-          ],
+          [for (var v in res[1].data) BbRepo.fromJson(v)],
         );
       },
       action: isViewer
diff --git a/lib/screens/gl_project.dart b/lib/screens/gl_project.dart
index 43a52d31..317cb803 100644
--- a/lib/screens/gl_project.dart
+++ b/lib/screens/gl_project.dart
@@ -206,7 +206,8 @@ class GlProjectScreen extends StatelessWidget {
                     leftIconData: Octicons.git_branch,
                     text: Text(AppLocalizations.of(context)!.branches),
                     rightWidget: Text(
-                        (branch == null ? p.defaultBranch : branch)! +
+                        ((branch == null ? p.defaultBranch : branch) ??
+                                '' /** empty project */) +
                             ' • ' +
                             branches.length.toString()),
                     onTap: () async {
diff --git a/lib/utils/utils.dart b/lib/utils/utils.dart
index 1cfd7cd6..0c287c1c 100644
--- a/lib/utils/utils.dart
+++ b/lib/utils/utils.dart
@@ -189,3 +189,5 @@ int sortByKey<T>(T key, T a, T b) {
   if (a != key && b == key) return 1;
   return 0;
 }
+
+const TOTAL_COUNT_FALLBACK = 999; // TODO: