diff --git a/backend/app/services/member_activation_service.py b/backend/app/services/member_activation_service.py
index d0b852f..da9bfa5 100644
--- a/backend/app/services/member_activation_service.py
+++ b/backend/app/services/member_activation_service.py
@@ -4,6 +4,7 @@ from sqlalchemy import select, func
 from sqlalchemy.orm import selectinload
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from app.core.auth import hash_password
 from app.db.models import ClassMembership, Class_, User
 
 
@@ -85,7 +86,8 @@ async def import_members(
         placeholder_email = f"inactive+{class_id}.{sid}@member.local"
         new_user = User(
             email=placeholder_email,
-            password_hash=None,
+            # Keep inactive imports compatible with older schemas where password_hash is NOT NULL.
+            password_hash=hash_password(secrets.token_urlsafe(24)),
             name=name,
             student_id=sid,
             role="student",