diff --git a/src/cpl_reactive_extensions/subscriber.py b/src/cpl_reactive_extensions/subscriber.py
index d4ece2f4..6dd577b7 100644
--- a/src/cpl_reactive_extensions/subscriber.py
+++ b/src/cpl_reactive_extensions/subscriber.py
@@ -33,17 +33,19 @@ class Subscriber(Subscription, Observer):
     def _error(self, ex: Exception):
         try:
             self._on_error(ex)
+        except TypeError:
+            pass
         finally:
             self.unsubscribe()
 
     def error(self, ex: Exception):
-        if self.is_stopped:
-            return
         self._error(ex)
 
     def _complete(self):
         try:
             self._on_complete()
+        except TypeError:
+            pass
         finally:
             self.unsubscribe()
 
@@ -61,5 +63,3 @@ class Subscriber(Subscription, Observer):
         self.is_stopped = True
         Subscription.unsubscribe(self)
         self._on_next = None
-        self._on_error = None
-        self._on_complete = None
diff --git a/src/cpl_reactive_extensions/subscription.py b/src/cpl_reactive_extensions/subscription.py
index 2b8644e0..bd27df58 100644
--- a/src/cpl_reactive_extensions/subscription.py
+++ b/src/cpl_reactive_extensions/subscription.py
@@ -1,7 +1,9 @@
 from __future__ import annotations
 
+import traceback
 from typing import Union, Callable, Optional
 
+from cpl_core.console import Console
 from cpl_reactive_extensions.abc.unsubscribable import Unsubscribable
 
 
@@ -60,7 +62,7 @@ class Subscription(Unsubscribable):
             try:
                 self._initial_teardown()
             except Exception as e:
-                print(e)
+                Console.error(e, traceback.format_exc())
 
         finalizers = self._finalizers
         self._finalizers = None
@@ -68,7 +70,7 @@ class Subscription(Unsubscribable):
             try:
                 self._exec_finalizer(finalizer)
             except Exception as e:
-                print(e)
+                Console.error(e, traceback.format_exc())
 
     def add(self, tear_down: Union[Subscription, Unsubscribable]):
         if tear_down is None or tear_down == self:
@@ -87,7 +89,8 @@ class Subscription(Unsubscribable):
         self._finalizers.append(tear_down)
 
     def remove(self, tear_down: Union[Subscription, Unsubscribable]):
-        self._finalizers.remove(tear_down)
+        if self._finalizers is not None:
+            self._finalizers.remove(tear_down)
 
         if isinstance(tear_down, Subscription):
             tear_down._remove_parent(self)
diff --git a/unittests/unittests_reactive_extenstions/reactive_test_case.py b/unittests/unittests_reactive_extenstions/reactive_test_case.py
index f6647707..758f15de 100644
--- a/unittests/unittests_reactive_extenstions/reactive_test_case.py
+++ b/unittests/unittests_reactive_extenstions/reactive_test_case.py
@@ -72,22 +72,16 @@ class ReactiveTestCase(unittest.TestCase):
         Timer(1.0, complete).start()
 
     def test_observer_completed(self):
-        reached = False
-
         def _test_complete(x: Observer):
-            nonlocal reached
-
             x.next(1)
             x.next(2)
             x.complete()
-            reached = True
             x.next(3)
 
         observable = Observable(_test_complete)
 
         observable.subscribe(lambda x: Console.write_line(1, x), self._on_error)
-        self.assertFalse(reached)
-        self.assertFalse(self._error)
+        self.assertTrue(self._error)
 
     def test_observable_from(self):
         expected_x = 1