Added to catch ProgrammingError when checking whether a user is in use in the Mia core application.

mia_core/models.py

@@ -22,7 +22,8 @@ import hashlib
 
 from dirtyfields import DirtyFieldsMixin
 from django.conf import settings
-from django.db import models, connection, OperationalError, transaction
+from django.db import models, connection, OperationalError, transaction, \
+    ProgrammingError
 from django.db.models.functions import Now
 from django.urls import reverse
 
@@ -185,6 +186,8 @@ class User(DirtyFieldsMixin, models.Model):
                 cursor.execute(sql, [self.pk, self.pk])
             except OperationalError:
                 return False
+            except ProgrammingError:
+                return False
             if cursor.fetchone() is None:
                 return False
             return True