diff --git a/bec_widgets/qt_utils/error_popups.py b/bec_widgets/qt_utils/error_popups.py
index 06edf6cb..417ecc01 100644
--- a/bec_widgets/qt_utils/error_popups.py
+++ b/bec_widgets/qt_utils/error_popups.py
@@ -71,8 +71,6 @@ class _ErrorPopupUtility(QObject):
 
     error_occurred = Signal(str, str, QWidget)
 
-
-
     def __init__(self, parent=None):
         super().__init__(parent=parent)
         self.error_occurred.connect(self.show_error_message)
diff --git a/tests/unit_tests/conftest.py b/tests/unit_tests/conftest.py
index a357f26d..2424a94c 100644
--- a/tests/unit_tests/conftest.py
+++ b/tests/unit_tests/conftest.py
@@ -1,6 +1,7 @@
 import pytest
 
 from bec_widgets.cli.rpc_register import RPCRegister
+from bec_widgets.qt_utils import error_popups
 from bec_widgets.utils import bec_dispatcher as bec_dispatcher_module
 
 
@@ -19,3 +20,8 @@ def bec_dispatcher(threads_check):
     bec_dispatcher.client.shutdown()
     # reinitialize singleton for next test
     bec_dispatcher_module.BECDispatcher.reset_singleton()
+
+
+@pytest.fixture(autouse=True)
+def clean_singleton():
+    error_popups._popup_utility_instance = None