diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4c34f7e..1ed91e2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Fixed
 
 * Make the required single platform destination explicit when creating an installation
+* Fix installation form submission on NetBox v4.6.5 when form mixins return no cleaned-data value
 
 ### Added
 
diff --git a/README.md b/README.md
index 26b7157..2481d4b 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ Die installierte Version kann anschließend geprüft werden:
 /opt/netbox/venv/bin/pip show netbox-slm
 ```
 
-Für diese Variante muss dort mindestens Version `1.11.1` stehen.
+Für diese Variante muss dort mindestens Version `1.11.2` stehen.
 
 ### 3. Plugin in NetBox aktivieren
 
diff --git a/netbox_slm/__init__.py b/netbox_slm/__init__.py
index dae1884..b498ee9 100644
--- a/netbox_slm/__init__.py
+++ b/netbox_slm/__init__.py
@@ -17,7 +17,7 @@ limitations under the License.
 from netbox.plugins import PluginConfig
 from django.utils.translation import gettext_lazy as _
 
-__version__ = "1.11.1"
+__version__ = "1.11.2"
 
 
 class SLMConfig(PluginConfig):
diff --git a/netbox_slm/forms/software_product_installation.py b/netbox_slm/forms/software_product_installation.py
index ebed762..5cf8ad3 100644
--- a/netbox_slm/forms/software_product_installation.py
+++ b/netbox_slm/forms/software_product_installation.py
@@ -75,15 +75,15 @@ class SoftwareProductInstallationForm(NetBoxModelForm):
         return version
 
     def clean(self):
-        cleaned_data = super().clean()
+        super().clean()
         destinations = [
-            cleaned_data.get("device"),
-            cleaned_data.get("virtualmachine"),
-            cleaned_data.get("cluster"),
+            self.cleaned_data.get("device"),
+            self.cleaned_data.get("virtualmachine"),
+            self.cleaned_data.get("cluster"),
         ]
         if sum(destination is not None for destination in destinations) != 1:
             raise ValidationError(_("Select exactly one platform destination: device, virtual machine, or cluster."))
-        return cleaned_data
+        return self.cleaned_data
 
 
 class SoftwareProductInstallationFilterForm(NetBoxModelFilterSetForm):