diff --git a/bitcoin_safe/gui/qt/main.py b/bitcoin_safe/gui/qt/main.py
index 8b96fe5..701f0ea 100644
--- a/bitcoin_safe/gui/qt/main.py
+++ b/bitcoin_safe/gui/qt/main.py
@@ -1343,8 +1343,6 @@ def sync(self) -> None:
             qt_wallet.sync()
 
     def closeEvent(self, event: Optional[QCloseEvent]) -> None:
-        self.threading_manager.end_threading_manager()
-
         self.config.last_wallet_files[str(self.config.network)] = [
             qt_wallet.file_path for qt_wallet in self.qt_wallets.values()
         ]
@@ -1352,13 +1350,16 @@ def closeEvent(self, event: Optional[QCloseEvent]) -> None:
         self.write_current_open_txs_to_config()
         self.config.save()
         self.save_all_wallets()
+
+        self.threading_manager.end_threading_manager()
+
         self.remove_all_qt_wallet()
 
         if self.new_startup_network:
             self.config.network = self.new_startup_network
             self.config.save()
 
-        logger.info(f"Finished close handling")
+        logger.info(f"Finished close handling of {self}")
         super().closeEvent(event)
 
     def restart(self, new_startup_network: bdk.Network | None = None) -> None:
diff --git a/bitcoin_safe/threading_manager.py b/bitcoin_safe/threading_manager.py
index e1ffbc0..183ebdd 100644
--- a/bitcoin_safe/threading_manager.py
+++ b/bitcoin_safe/threading_manager.py
@@ -31,6 +31,7 @@
 import sys
 import threading
 from collections import deque
+from types import TracebackType
 from typing import Any, Callable, NamedTuple, Optional, Tuple
 
 from PyQt6.QtCore import QObject, QThread, pyqtSignal, pyqtSlot
@@ -55,7 +56,7 @@ class Worker(QObject):
     """Worker object to perform tasks in a separate thread."""
 
     finished: pyqtSignal = pyqtSignal(object, object, object)  # Result, cb_done, cb_success/error
-    error: pyqtSignal = pyqtSignal(object)
+    error: pyqtSignal = pyqtSignal(object, object)
 
     def __init__(self, task: Task) -> None:
         super().__init__()
@@ -107,6 +108,8 @@ def add_and_start(
             NoThread().add_and_start(do, on_success, on_done, on_error)
             return self
 
+        self.cancelled = False
+
         logger.debug(f"Starting new thread {do}.")
         task: Task = Task(do, on_success, on_done, on_error, cancel)
         self.worker = Worker(task)
@@ -126,36 +129,41 @@ def thread_name(self):
         if self.worker.thread_name:
             return self.worker.thread_name
 
-    def on_error(self, error_info):
+    def on_error(
+        self,
+        error_info: tuple[type[BaseException], BaseException, TracebackType],
+        cb_error: Callable[[Any], None],
+    ):
         if self.worker:
-            self.worker.task.cb_error(error_info)
+            cb_error(error_info)
         self.my_quit()
 
     @pyqtSlot(object, object, object)
     def on_done(self, result: Any, cb_done: Callable[[Any], None], cb_result: Callable[[Any], None]) -> None:
         """Handle task completion."""
-        logger.debug(f"Thread done: {self.thread_name}.")
-        cb_done(result)
-        cb_result(result)
+        if not self.cancelled:
+            logger.debug(f"Thread done: {self.thread_name}.")
+            cb_done(result)
+            cb_result(result)
         self.my_quit()
 
     def stop(self) -> None:
         """Stops the thread and any associated task cancellation if defined."""
-        logger.info("Stopping TaskThread and associated worker.")
+        logger.debug(f"Stopping {self.thread_name}.")
         if self.worker and self.worker.task.cancel:
-            logger.debug(f"Stopping {self.thread_name}.")
+            self.cancelled = True
             self.worker.task.cancel()
         self.my_quit()
+        logger.debug(f"Stopped {self.thread_name}.")
 
     def my_quit(self):
+        name = self.thread_name
         try:
+            self.cancelled = True
             self.quit()
             self.wait()
-            # cannot put it in finally, since QThread might be already destroyed
-            # and then self is not recognized as a QThread decendent any more in pyqtSignal
-            self.deleteLater()
         except:
-            pass
+            logger.error(f"An error during the shutdown of {name}")
 
 
 class NoThread:
@@ -230,9 +238,11 @@ def stop_and_wait_all(self):
         # Wait for all threads to finish
         while self.taskthreads:
             taskthread = self.taskthreads.pop()
+            logger.debug(f"stop taskthreads {taskthread}")
             taskthread.stop()
 
     def end_threading_manager(self):
+        logger.debug(f"end_threading_manager of {self}")
         self.stop_and_wait_all()
 
         if self.threading_parent and self in self.threading_parent.threading_manager_children: