diff --git a/lib/core/security/ssl_certificate_support.dart b/lib/core/security/ssl_certificate_support.dart
index f4169753..887f7133 100644
--- a/lib/core/security/ssl_certificate_support.dart
+++ b/lib/core/security/ssl_certificate_support.dart
@@ -234,8 +234,9 @@ Future<bool> _isProcessAlive(int owner) async {
       return result.exitCode != 0 || '${result.stdout}'.contains('$owner');
     }
     return (await Process.run('kill', ['-0', '$owner'])).exitCode == 0;
-  } catch (_) {
+  } catch (e) {
     // Cannot tell: leave the directory alone.
+    logIgnored('ssl_certificate_support', e);
     return true;
   }
 }
diff --git a/lib/core/storage/folders_storage.dart b/lib/core/storage/folders_storage.dart
index c8b4a565..c6701571 100644
--- a/lib/core/storage/folders_storage.dart
+++ b/lib/core/storage/folders_storage.dart
@@ -4,6 +4,8 @@ import 'dart:io';
 import 'package:flutter/foundation.dart';
 import 'package:querya_desktop/core/storage/app_data_root.dart';
 
+import 'package:querya_desktop/core/util/querya_log.dart';
+
 import 'local_db.dart';
 
 const _legacyFileName = 'folders.json';
@@ -31,6 +33,7 @@ class FoldersStorage {
       // Not marked loaded: the next call reads again instead of caching an
       // empty list for the rest of the session.
       debugPrint('FoldersStorage.load: $e');
+      QueryaLog.instance.error('FoldersStorage', 'load failed', error: e);
       _folders = [];
     }
     return folders;
@@ -62,6 +65,7 @@ class FoldersStorage {
       await file.delete();
     } catch (e) {
       debugPrint('FoldersStorage._migrateFromLegacyIfNeeded: $e');
+      QueryaLog.instance.error('FoldersStorage', 'legacy folders.json migration failed', error: e);
     }
   }
 
diff --git a/lib/core/util/querya_log.dart b/lib/core/util/querya_log.dart
index acb6102e..98c0ed90 100644
--- a/lib/core/util/querya_log.dart
+++ b/lib/core/util/querya_log.dart
@@ -133,7 +133,17 @@ class QueryaLog {
   Future<void> _append(String line) async {
     final dir = _directory!;
     final bytes = utf8.encode(line);
-    if (_size > 0 && _size + bytes.length > maxBytes) await _rotate(dir);
+    if (_size > 0 && _size + bytes.length > maxBytes) {
+      try {
+        await _rotate(dir);
+      } catch (e) {
+        // A file that cannot be renamed (open in a viewer, wrong permissions)
+        // must not stop the log: keep writing to the current file and try
+        // again after another maxBytes.
+        debugPrint('QueryaLog: could not rotate: $e');
+        _size = 0;
+      }
+    }
     await _file(dir, 0).writeAsBytes(bytes, mode: FileMode.append);
     _size += bytes.length;
   }
diff --git a/lib/features/workspace/generic_sql_workspace.dart b/lib/features/workspace/generic_sql_workspace.dart
index 07d99d1b..bc863cd7 100644
--- a/lib/features/workspace/generic_sql_workspace.dart
+++ b/lib/features/workspace/generic_sql_workspace.dart
@@ -637,6 +637,10 @@ class GenericSqlWorkspaceState extends material.State<GenericSqlWorkspace> {
       }
     }
 
+    // The tab may have been closed while the settings read or the dialog was
+    // pending.
+    if (!mounted) return;
+
     // Only now: cancelling the destructive dialog above must keep the edits.
     if (session.stagingBuffer != null && session.stagingBuffer!.isDirty) {
       session.stagingBuffer?.dispose();
diff --git a/test/core/util/querya_log_test.dart b/test/core/util/querya_log_test.dart
index 92ce2433..1c7867a7 100644
--- a/test/core/util/querya_log_test.dart
+++ b/test/core/util/querya_log_test.dart
@@ -108,6 +108,21 @@ void main() {
     expect(await read(QueryaLog.fileName), contains('kept'));
   });
 
+  test('a rotation that fails does not stop the log', () async {
+    final log = QueryaLog(maxBytes: 100, maxFiles: 2);
+    await log.init(root);
+    // A directory where the rotated file must go makes the rename fail.
+    await Directory(p.join(root.path, 'querya.1.log')).create();
+    await File(p.join(root.path, 'querya.1.log', 'x')).writeAsString('x');
+    for (var i = 0; i < 10; i++) {
+      log.info('t', 'line number $i ${'x' * 20}');
+    }
+    log.info('t', 'the last line');
+    await log.flush();
+
+    expect(await read(QueryaLog.fileName), contains('the last line'));
+  });
+
   test('logIgnored writes to the shared log', () async {
     await QueryaLog.instance.init(root);
     logIgnored('Somewhere.close', StateError('already closed'));