From ac9531378d3bb37744a81604ac66705729b2edef Mon Sep 17 00:00:00 2001
From: Sydney Runkle <sydneymarierunkle@gmail.com>
Date: Fri, 17 Apr 2026 14:51:03 -0400
Subject: [PATCH] fix(channels): align DiffChannel.is_available with
 BinaryOperatorAggregate

---
 libs/langgraph/langgraph/channels/diff.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/langgraph/langgraph/channels/diff.py b/libs/langgraph/langgraph/channels/diff.py
index 56c925c3d..09569bb33 100644
--- a/libs/langgraph/langgraph/channels/diff.py
+++ b/libs/langgraph/langgraph/channels/diff.py
@@ -142,7 +142,7 @@ class DiffChannel(Generic[Value], BaseChannel[list[Value], Value, DiffDelta]):
         return self.value
 
     def is_available(self) -> bool:
-        return self.value is not MISSING and self.value is not None
+        return self.value is not MISSING
 
     def checkpoint(self) -> DiffDelta:
         return DiffDelta(