Fixes #3822: Fix exception when editing a device bay (regression from #3596)

docs/release-notes/version-2.6.md

@@ -17,6 +17,7 @@
 * [#3780](https://github.com/netbox-community/netbox/issues/3780) - Fix AttributeError exception in API docs
 * [#3809](https://github.com/netbox-community/netbox/issues/3809) - Filter platform by manufacturer when editing devices
 * [#3811](https://github.com/netbox-community/netbox/issues/3811) - Fix filtering of racks by group on device list
+* [#3822](https://github.com/netbox-community/netbox/issues/3822) - Fix exception when editing a device bay (regression from #3596)
 
 ---
 

netbox/dcim/models.py

@@ -2597,7 +2597,7 @@ class DeviceBay(ComponentModel):
         # Check that the installed device is not already installed elsewhere
         if self.installed_device:
             current_bay = DeviceBay.objects.filter(installed_device=self.installed_device).first()
-            if current_bay:
+            if current_bay != self:
                 raise ValidationError({
                     'installed_device': "Cannot install the specified device; device is already installed in {}".format(
                         current_bay