diff --git a/freeadmin/contrib/adapters/tortoise/adapter.py b/freeadmin/contrib/adapters/tortoise/adapter.py
index 791bb6f..7f323cd 100644
--- a/freeadmin/contrib/adapters/tortoise/adapter.py
+++ b/freeadmin/contrib/adapters/tortoise/adapter.py
@@ -509,6 +509,8 @@ async def m2m_clear(self, manager) -> None:
 
         This coroutine must be awaited.
         """
+        if manager is None:
+            return
         await manager.clear()
 
     async def m2m_add(self, manager, objs: Iterable[Model]) -> None:
@@ -520,6 +522,8 @@ async def m2m_add(self, manager, objs: Iterable[Model]) -> None:
 
         This coroutine must be awaited.
         """
+        if manager is None:
+            return
         await manager.add(*objs)
 
     def values(self, qs: QuerySet, *fields: str) -> QuerySet:
diff --git a/freeadmin/core/interface/base.py b/freeadmin/core/interface/base.py
index ab3dbfe..65d5282 100644
--- a/freeadmin/core/interface/base.py
+++ b/freeadmin/core/interface/base.py
@@ -1238,9 +1238,17 @@ def clean(
         return data, m2m_ops
 
     async def m2m_clear(self, manager):
+        """Safely clear all links from the provided relation manager."""
+
+        if manager is None:
+            return
         await self.adapter.m2m_clear(manager)
 
     async def m2m_add(self, manager, objs: Iterable[Any]):
+        """Attach ``objs`` to the provided relation manager when available."""
+
+        if manager is None:
+            return
         await self.adapter.m2m_add(manager, objs)
 
     async def create(