diff --git a/provides.py b/provides.py
index eca7d67..d2b2cb1 100644
--- a/provides.py
+++ b/provides.py
@@ -93,8 +93,12 @@ class ManilaPluginProvides(reactive.RelationBase):
 
     def clear_changed(self):
         """Provide a convenient method to clear the .changed relation"""
-        conversation = self.conversation()
-        conversation.remove_state(self.states.changed)
+        try:
+            self.remove_state(self.states.changed)
+        except ValueError:
+            # work around Juju 1.25.x error where it can't find the scope for
+            # the interface (randomly) - Bug #1663633
+            pass
 
     @property
     def name(self):
diff --git a/requires.py b/requires.py
index c9fbccb..54637bb 100644
--- a/requires.py
+++ b/requires.py
@@ -120,8 +120,12 @@ class ManilaPluginRequires(reactive.RelationBase):
 
     def clear_changed(self):
         """Provide a convenient method to clear the .changed relation"""
-        conversation = self.conversation()
-        conversation.remove_state(self.states.changed)
+        try:
+            self.remove_state(self.states.changed)
+        except ValueError:
+            # this works around a Juju 1.25.x bug where it can't find the right
+            # scoped conversation - Bug #1663633
+            pass
 
     def set_authentication_data(self, value, name=None):
         """Set the authentication data to the plugin charm.  This is to enable