diff --git a/lib/providers/content/attachment.dart b/lib/providers/content/attachment.dart
index c972f41..8164c8a 100644
--- a/lib/providers/content/attachment.dart
+++ b/lib/providers/content/attachment.dart
@@ -82,7 +82,7 @@ class AttachmentProvider extends GetConnect {
       }),
     );
     if (resp.statusCode != 200) {
-      throw Exception(resp.bodyString);
+      throw Exception('${resp.statusCode}: ${resp.bodyString}');
     }
 
     return resp;
diff --git a/lib/translations.dart b/lib/translations.dart
index 227f9ab..f978ea2 100644
--- a/lib/translations.dart
+++ b/lib/translations.dart
@@ -99,6 +99,9 @@ class SolianMessages extends Translations {
           'attachmentAddFile': 'Attach file',
           'attachmentSetting': 'Adjust attachment',
           'attachmentAlt': 'Alternative text',
+          'attachmentLoadFailed': 'Load Attachment Failed',
+          'attachmentLoadFailedCaption':
+              'Something went wrong during loading the attachment metadata...',
           'realm': 'Realm',
           'realms': 'Realms',
           'realmOrganizing': 'Organize a realm',
@@ -274,6 +277,8 @@ class SolianMessages extends Translations {
           'attachmentAddFile': '附加文件',
           'attachmentSetting': '调整附件',
           'attachmentAlt': '替代文字',
+          'attachmentLoadFailed': '加载失败',
+          'attachmentLoadFailedCaption': '有错误发生于加载附件元数据的过程中了…',
           'realm': '领域',
           'realms': '领域',
           'realmOrganizing': '组织领域',
diff --git a/lib/widgets/attachments/attachment_list.dart b/lib/widgets/attachments/attachment_list.dart
index 6dbfeea..002a4d5 100644
--- a/lib/widgets/attachments/attachment_list.dart
+++ b/lib/widgets/attachments/attachment_list.dart
@@ -40,12 +40,15 @@ class _AttachmentListState extends State<AttachmentList> {
     for (var idx = 0; idx < widget.attachmentsId.length; idx++) {
       provider.getMetadata(widget.attachmentsId[idx]).then((resp) {
         progress++;
-        _attachmentsMeta[idx] = Attachment.fromJson(resp.body);
+        if (resp.body != null) {
+          _attachmentsMeta[idx] = Attachment.fromJson(resp.body);
+        }
         if (progress == widget.attachmentsId.length) {
-          setState(() {
-            calculateAspectRatio();
-            _isLoading = false;
-          });
+          calculateAspectRatio();
+
+          if (mounted) {
+            setState(() => _isLoading = false);
+          }
         }
       });
     }
@@ -118,6 +121,31 @@ class _AttachmentListState extends State<AttachmentList> {
       itemCount: _attachmentsMeta.length,
       itemBuilder: (context, idx, _) {
         final element = _attachmentsMeta[idx];
+
+        if (element == null) {
+          return Center(
+            child: Container(
+              constraints: const BoxConstraints(maxWidth: 280),
+              child: Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: [
+                  const Icon(Icons.close, size: 32),
+                  const SizedBox(height: 8),
+                  Text(
+                    'attachmentLoadFailed'.tr,
+                    style: const TextStyle(
+                        fontWeight: FontWeight.bold, fontSize: 16),
+                  ),
+                  Text(
+                    'attachmentLoadFailedCaption'.tr,
+                    textAlign: TextAlign.center,
+                  ),
+                ],
+              ),
+            ),
+          );
+        }
+
         return GestureDetector(
           child: Container(
             width: MediaQuery.of(context).size.width,
@@ -129,7 +157,7 @@ class _AttachmentListState extends State<AttachmentList> {
               children: [
                 AttachmentItem(
                   parentId: widget.parentId,
-                  key: Key('a${element!.uuid}'),
+                  key: Key('a${element.uuid}'),
                   item: element,
                   badge: _attachmentsMeta.length > 1
                       ? '${idx + 1}/${_attachmentsMeta.length}'
diff --git a/lib/widgets/attachments/attachment_publish.dart b/lib/widgets/attachments/attachment_publish.dart
index c2a5cb2..8ae5a51 100644
--- a/lib/widgets/attachments/attachment_publish.dart
+++ b/lib/widgets/attachments/attachment_publish.dart
@@ -154,7 +154,7 @@ class _AttachmentPublishingPopupState extends State<AttachmentPublishingPopup> {
       var result = Attachment.fromJson(resp.body);
       setState(() => _attachments.add(result));
       widget.onUpdate(_attachments.map((e) => e!.id).toList());
-    } catch (e) {
+    } catch (err) {
       rethrow;
     }
   }
@@ -239,7 +239,8 @@ class _AttachmentPublishingPopupState extends State<AttachmentPublishingPopup> {
                   itemCount: _attachments.length,
                   itemBuilder: (context, index) {
                     final element = _attachments[index];
-                    final fileType = element!.mimetype.split('/').first;
+                    var fileType = element!.mimetype.split('/').firstOrNull;
+                    fileType ??= 'unknown';
                     return Container(
                       padding:
                           const EdgeInsets.only(left: 16, right: 8, bottom: 16),