diff --git a/conda_env.yml b/conda_env.yml
index 0e21ff5..8beca5c 100644
--- a/conda_env.yml
+++ b/conda_env.yml
@@ -6,15 +6,18 @@ channels:
   - defaults
 dependencies:
   - python=3.10
-  - napari=0.4.18
+  - napari[version='>=0.4.19']
   - pandas
   - numpy
   - pyqt
   - matplotlib
   - scipy
   - scikit-learn
-  - napari-clusters-plotter
   - tqdm
   - mrcfile
   - cuml=23.12
   - cuda-version=11.8
+  - git
+  - pip:
+      - napari-boxmanager # Install napari-boxmanager via pip because otherwise scripts in setup.cfg are ignored
+      - git+https://github.com/BiAPoL/napari-clusters-plotter.git@b9b08f3500c9b0831d2cd1b4d9a757c688f76005 #until 0.7.4 is released
diff --git a/src/napari_tomotwin/umap_tool.py b/src/napari_tomotwin/umap_tool.py
index c4fb616..37e73c8 100644
--- a/src/napari_tomotwin/umap_tool.py
+++ b/src/napari_tomotwin/umap_tool.py
@@ -160,6 +160,10 @@ def select_file_clicked():
         self.load_umap_tool: LoadUmapTool
 
         def load_umap_btn_clicked():
+
+            if self._selected_umap_pth.text() == None or self._selected_umap_pth.text() == "":
+                return
+
             if self.plotter_widget is not None:
                 ret = QMessageBox.question(self, '', "Do you really want to close the current UMAP and load another?", QMessageBox.Yes | QMessageBox.No)
                 if ret == QMessageBox.No:
@@ -254,7 +258,7 @@ def patched_run(self, *args, **kwargs):
                 self._run_show_targets.setEnabled(True)
                 if self.nvidia_available:
                     self._run_umap_recalc_btn.setEnabled(True)
-        except:
+        except Exception as e:
             pass
         return result
 
@@ -318,7 +322,7 @@ def set_umap_tool(self, tool: LoadUmapTool):
         self.load_umap_tool = tool
 
     def _on_refine_click(self):
-        self.viewer.window._qt_window.setEnabled(False)
+        self.viewer.window.setEnabled(False)
         self.delete_points_layer()
         self.reestimate_umap()
 
@@ -368,14 +372,15 @@ def show_targets_callback(self, future: futures.Future):
                                                           out_of_slice_display=True,
                                                           name="Targets")
 
-        self.viewer.window._qt_window.setEnabled(True)
+        self.viewer.window.setEnabled(True)
         self.progressBar.setHidden(True)
         self.progressBar.set_label_text("")
 
 
     def show_umap_callback(self, future: futures.Future):
         (umap_embeddings, used_embeddings) = future.result()
-        self.viewer.window._qt_window.setEnabled(True)
+        self.viewer.window.setEnabled(True)
+        self.viewer.window.set
         self.napari_update_umap(umap_embeddings, used_embeddings)
 
     def reestimate_umap(self):