diff --git a/commentaries/admin.py b/commentaries/admin.py
index 441d0f229c0eaf8bbba274a5402a9ee888b6c31c..93aee6375bdb1b36584042765d5e5220d7d1ca0e 100644
--- a/commentaries/admin.py
+++ b/commentaries/admin.py
@@ -9,10 +9,13 @@ from scipost.models import Contributor
 
 class CommentaryAdminForm(forms.ModelForm):
     authors = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.order_by('user__last_name'))
     authors_claims = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.order_by('user__last_name'))
     authors_false_claims = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.order_by('user__last_name'))
 
     class Meta:
diff --git a/journals/admin.py b/journals/admin.py
index dc98d36072c7fd63e5dd98d2c67e8836d53f7b07..8c82762bbe9cb7df533f9aec127ecb2ca1328fe7 100644
--- a/journals/admin.py
+++ b/journals/admin.py
@@ -42,8 +42,10 @@ class PublicationAdminForm(forms.ModelForm):
     authors = forms.ModelMultipleChoiceField(
         queryset=Contributor.objects.order_by('user__last_name'))
     authors_claims = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.order_by('user__last_name'))
     authors_false_claims = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.order_by('user__last_name'))
 
     class Meta:
diff --git a/scipost/admin.py b/scipost/admin.py
index dc4ef69f237f2511068edde40147e41eb3d2e9d5..5db931f3ef878d4e7cd3e23cd82a5ed1e2964acb 100644
--- a/scipost/admin.py
+++ b/scipost/admin.py
@@ -86,6 +86,7 @@ def get_remark_type(remark):
 
 class RemarkAdminForm(forms.ModelForm):
     submission = forms.ModelChoiceField(
+        required=False,
         queryset=Submission.objects.order_by('-arxiv_identifier_w_vn_nr'))
 
     class Meta:
@@ -104,8 +105,10 @@ admin.site.register(Remark, RemarkAdmin)
 
 class DraftInvitationAdminForm(forms.ModelForm):
     cited_in_submission = forms.ModelChoiceField(
+        required=False,
         queryset=Submission.objects.order_by('-arxiv_identifier_w_vn_nr'))
     cited_in_publication = forms.ModelChoiceField(
+        required=False,
         queryset=Publication.objects.order_by('-publication_date'))
 
     class Meta:
@@ -121,8 +124,10 @@ admin.site.register(DraftInvitation, DraftInvitationAdmin)
 
 class RegistrationInvitationAdminForm(forms.ModelForm):
     cited_in_submission = forms.ModelChoiceField(
+        required=False,
         queryset=Submission.objects.order_by('-arxiv_identifier_w_vn_nr'))
     cited_in_publication = forms.ModelChoiceField(
+        required=False,
         queryset=Publication.objects.order_by('-publication_date'))
 
     class Meta:
diff --git a/submissions/admin.py b/submissions/admin.py
index 1cac3e6107410e539ede53109214ecfee3bda976..10fa602e0f82a198e68d393f362720d504addee9 100644
--- a/submissions/admin.py
+++ b/submissions/admin.py
@@ -14,10 +14,13 @@ def submission_short_title(obj):
 
 class SubmissionAdminForm(forms.ModelForm):
     authors = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.order_by('user__last_name'))
     authors_claims = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.order_by('user__last_name'))
     authors_false_claims = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.order_by('user__last_name'))
 
     class Meta:
@@ -102,18 +105,22 @@ class EICRecommendationAdminForm(forms.ModelForm):
     submission = forms.ModelChoiceField(
         queryset=Submission.objects.order_by('-arxiv_identifier_w_vn_nr'))
     eligible_to_vote = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.filter(
             user__groups__name__in=['Editorial College'],
         ).order_by('user__last_name'))
     voted_for = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.filter(
             user__groups__name__in=['Editorial College'],
         ).order_by('user__last_name'))
     voted_against = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.filter(
             user__groups__name__in=['Editorial College'],
         ).order_by('user__last_name'))
     voted_abstain = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.filter(
             user__groups__name__in=['Editorial College'],
         ).order_by('user__last_name'))
diff --git a/theses/admin.py b/theses/admin.py
index 3fc5fd571457f533b471b6d379c129356a943d4f..762043c8deb4a77bade074668e87e1417f9c3db0 100644
--- a/theses/admin.py
+++ b/theses/admin.py
@@ -9,10 +9,13 @@ from scipost.models import Contributor
 
 class ThesisLinkAdminForm(forms.ModelForm):
     author_claims = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.order_by('user__last_name'))
     author_false_claims = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.order_by('user__last_name'))
     supervisor_as_cont = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.order_by('user__last_name'))
 
     class Meta:
diff --git a/virtualmeetings/admin.py b/virtualmeetings/admin.py
index 61bf7ab92665dd958f36e3b97756996c3924c80e..6baf0995ccc27f01638926563db60ed849deebda 100644
--- a/virtualmeetings/admin.py
+++ b/virtualmeetings/admin.py
@@ -23,14 +23,17 @@ admin.site.register(Feedback, FeedbackAdmin)
 
 class NominationAdminForm(forms.ModelForm):
     in_agreement = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.filter(
             user__groups__name__in=['Editorial College'],
         ).order_by('user__last_name'))
     in_notsure = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.filter(
             user__groups__name__in=['Editorial College'],
         ).order_by('user__last_name'))
     in_disagreement = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.filter(
             user__groups__name__in=['Editorial College'],
         ).order_by('user__last_name'))
@@ -48,14 +51,17 @@ admin.site.register(Nomination, NominationAdmin)
 
 class MotionAdminForm(forms.ModelForm):
     in_agreement = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.filter(
             user__groups__name__in=['Editorial College'],
         ).order_by('user__last_name'))
     in_notsure = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.filter(
             user__groups__name__in=['Editorial College'],
         ).order_by('user__last_name'))
     in_disagreement = forms.ModelMultipleChoiceField(
+        required=False,
         queryset=Contributor.objects.filter(
             user__groups__name__in=['Editorial College'],
         ).order_by('user__last_name'))