diff --git a/doc/changelog.d/375.miscellaneous.md b/doc/changelog.d/375.miscellaneous.md
new file mode 100644
index 00000000..447faeef
--- /dev/null
+++ b/doc/changelog.d/375.miscellaneous.md
@@ -0,0 +1 @@
+Fix: Uninitialized variable in PyVistaBackendInterface
diff --git a/src/ansys/tools/visualization_interface/backends/pyvista/pyvista.py b/src/ansys/tools/visualization_interface/backends/pyvista/pyvista.py
index 1154d3d5..13640b5d 100644
--- a/src/ansys/tools/visualization_interface/backends/pyvista/pyvista.py
+++ b/src/ansys/tools/visualization_interface/backends/pyvista/pyvista.py
@@ -131,6 +131,8 @@ def __init__(
         # Map that relates PyVista actors with PyAnsys objects
         self._object_to_actors_map = {}
 
+        self._edge_actors_map: Dict[pv.Actor, EdgePlot] = {}
+
         # PyVista plotter
         self._pl = None
 
diff --git a/tests/test_generic_plotter.py b/tests/test_generic_plotter.py
index 6e50b64e..1377321c 100644
--- a/tests/test_generic_plotter.py
+++ b/tests/test_generic_plotter.py
@@ -27,7 +27,7 @@
 import pytest
 import pyvista as pv
 
-from ansys.tools.visualization_interface import ClipPlane, MeshObjectPlot, Plotter
+from ansys.tools.visualization_interface import ClipPlane, EdgePlot, MeshObjectPlot, Plotter
 from ansys.tools.visualization_interface.backends.pyvista import PyVistaBackend
 from ansys.tools.visualization_interface.backends.pyvista.picker import Picker
 
@@ -93,7 +93,9 @@ def test_plotter_add_structured_grid():
 def test_plotter_add_custom():
     """Adds a MeshObjectPlot object to the plotter."""
     sphere = pv.Sphere()
-    custom = MeshObjectPlot(CustomTestClass("myname"), sphere)
+    edge = pv.Cube((0, 1, 0))
+    custom_edge = EdgePlot(CustomTestClass("myname_edge"), edge)
+    custom = MeshObjectPlot(CustomTestClass("myname"), sphere, edges=[custom_edge])
     pl = Plotter()
     pl.plot(custom)
     pl.show()