diff --git a/submissions/forms.py b/submissions/forms.py
index 950d8ad1bd0221e4b843d908eeb173d52e60d9b3..e6b3cd433e0f6adc4f31f247a07fd4751ce104fa 100644
--- a/submissions/forms.py
+++ b/submissions/forms.py
@@ -640,6 +640,6 @@ class SubmissionCycleChoiceForm(forms.ModelForm):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.fields['refereeing_cycle'].default = None
-        other_submission = self.instance.other_versions[0]
+        other_submission = self.instance.other_versions.first()
         if other_submission:
             self.fields['referees_reinvite'].queryset = other_submission.referee_invitations.all()