diff --git a/profiles/forms.py b/profiles/forms.py
index 3d9c92da675e1079c8de880aea7eeaa0def76d50..cdb1a8e1df1a78efc6479ee254ec85a9fff29984 100644
--- a/profiles/forms.py
+++ b/profiles/forms.py
@@ -15,6 +15,20 @@ class ProfileForm(forms.ModelForm):
                   'discipline', 'expertises', 'orcid_id', 'webpage',
                   'accepts_SciPost_emails', 'accepts_refereeing_requests']
 
+    def clean_email(self):
+        """
+        Check that the email isn't yet associated to an existing Profile
+        (via either the email field or the m2m-related alternativeemails).
+        """
+        cleaned_email = self.cleaned_data['email']
+        if Profile.objects.filter(email=cleaned_email).exists:
+            raise forms.ValidationError(
+                'A Profile with this email (as primary email) already exists.')
+        elif Profile.objects.filter(alternativeemails__in=cleaned_email).exists():
+            raise forms.ValidationError(
+                'A Profile with this email (as alternative email) already exists.')
+        return cleaned_email
+
 
 class AlternativeEmailForm(forms.ModelForm):
 
diff --git a/profiles/views.py b/profiles/views.py
index 3eaa6658b37ddd425f2ffc5f7e15795ba13f2929..d4a122f61aa8aae6f0205d50c653d2f9f42d9c3e 100644
--- a/profiles/views.py
+++ b/profiles/views.py
@@ -104,7 +104,8 @@ class ProfileListView(PermissionsMixin, ListView):
         context['subject_areas'] = SCIPOST_SUBJECT_AREAS
         contributors_wo_profile = Contributor.objects.filter(profile=None)
         context['nr_contributors_wo_profile'] = contributors_wo_profile.count()
-        context['next_contributor_wo_profile'] = random.choice(contributors_wo_profile)
+        #context['next_contributor_wo_profile'] = random.choice(contributors_wo_profile)
+        context['next_contributor_wo_profile'] = contributors_wo_profile.first()
         context['alternative_email_form'] = AlternativeEmailForm()
         return context