diff --git a/CTFd/schemas/users.py b/CTFd/schemas/users.py
index 359a97f3..07c49f65 100644
--- a/CTFd/schemas/users.py
+++ b/CTFd/schemas/users.py
@@ -1,6 +1,7 @@
 from marshmallow import ValidationError, post_dump, pre_load, validate
 from marshmallow.fields import Nested
 from marshmallow_sqlalchemy import field_for
+from sqlalchemy.orm import load_only
 
 from CTFd.models import FieldEntries, UserFields, Users, ma
 from CTFd.schemas.fields import FieldEntriesSchema
@@ -51,7 +52,9 @@ class UserSchema(ma.ModelSchema):
     )
     country = field_for(Users, "country", validate=[validate_country_code])
     password = field_for(Users, "password")
-    fields = Nested(FieldEntriesSchema, partial=True, many=True, attribute="field_entries")
+    fields = Nested(
+        FieldEntriesSchema, partial=True, many=True, attribute="field_entries"
+    )
 
     @pre_load
     def validate_name(self, data):
@@ -196,6 +199,7 @@ class UserSchema(ma.ModelSchema):
             user_id = data.get("id")
             if user_id:
                 target_user = Users.query.filter_by(id=data["id"]).first()
+                provided_ids = []
                 for f in fields:
                     f.pop("id", None)
                     field_id = f.get("field_id")
@@ -209,10 +213,23 @@ class UserSchema(ma.ModelSchema):
                     ).first()
                     if entry:
                         f["id"] = entry.id
+
+                # Extremely dirty hack to prevent deleting previously provided data.
+                # This needs a better soln.
+                entries = (
+                    FieldEntries.query.options(load_only("id"))
+                    .filter_by(user_id=current_user.id)
+                    .all()
+                )
+                print(entries)
+                for entry in entries:
+                    if entry.id not in provided_ids:
+                        fields.append({"id": entry.id})
             else:
                 # Marshmallow automatically links the fields to newly created users
                 pass
         else:
+            provided_ids = []
             for f in fields:
                 # Remove any existing set
                 f.pop("id", None)
@@ -233,6 +250,19 @@ class UserSchema(ma.ModelSchema):
 
                 if entry:
                     f["id"] = entry.id
+                    provided_ids.append(entry.id)
+
+            # Extremely dirty hack to prevent deleting previously provided data.
+            # This needs a better soln.
+            entries = (
+                FieldEntries.query.options(load_only("id"))
+                .filter_by(user_id=current_user.id)
+                .all()
+            )
+            print(entries)
+            for entry in entries:
+                if entry.id not in provided_ids:
+                    fields.append({"id": entry.id})
 
     @post_dump()
     def process_fields(self, data):