diff --git a/db/user.py b/db/user.py
index d3e1401d..3847ee88 100644
--- a/db/user.py
+++ b/db/user.py
@@ -46,16 +46,17 @@ def profile_pic(self):
         path = f'user/profile/{self.id}.png'
         if fs.exists(path):
             return f"{decouple_config('BE_DOMAIN_NAME')}{fs.url(path)}"
-        
+
     def save(self, *args, **kwargs):
-        full_name = f"{self.first_name}{self.last_name or ''}".replace(" ", "").lower()[:85]
-        self.muid = f"{full_name}@mulearn"
-
-        counter = 0
-        while User.objects.filter(muid=self.muid).exists():
-            counter += 1
-            self.muid = f"{full_name}-{counter}@mulearn"
-            
+        if self.pk is None:
+            full_name = f"{self.first_name}{self.last_name or ''}".replace(" ", "").lower()[:85]
+            self.muid = f"{full_name}@mulearn"
+
+            counter = 0
+            while User.objects.filter(muid=self.muid).exists():
+                counter += 1
+                self.muid = f"{full_name}-{counter}@mulearn"
+
         return super().save(*args, **kwargs)