diff --git a/libs/langgraph/langgraph/pregel/algo.py b/libs/langgraph/langgraph/pregel/algo.py
index f3d82c835..f6301a379 100644
--- a/libs/langgraph/langgraph/pregel/algo.py
+++ b/libs/langgraph/langgraph/pregel/algo.py
@@ -384,7 +384,7 @@ def prepare_next_tasks(
             try:
                 val = next(
                     _proc_input(
-                        step, name, proc, managed, channels, for_execution=for_execution
+                        step, proc, managed, channels, for_execution=for_execution
                     )
                 )
             except StopIteration:
@@ -474,7 +474,6 @@ def prepare_next_tasks(
 
 def _proc_input(
     step: int,
-    name: str,
     proc: PregelNode,
     managed: ManagedValueMapping,
     channels: Mapping[str, BaseChannel],
@@ -485,16 +484,17 @@ def _proc_input(
     # then invoke the process with the values of all non-empty channels
     if isinstance(proc.channels, dict):
         try:
-            val: dict = {
-                k: read_channel(
-                    channels,
-                    chan,
-                    catch=chan not in proc.triggers,
-                )
-                if chan in channels
-                else managed[k](step)
-                for k, chan in proc.channels.items()
-            }
+            val: dict[str, Any] = {}
+            for k, chan in proc.channels.items():
+                if chan in proc.triggers:
+                    val[k] = read_channel(channels, chan, catch=False)
+                elif chan in channels:
+                    try:
+                        val[k] = read_channel(channels, chan, catch=False)
+                    except EmptyChannelError:
+                        continue
+                else:
+                    val[k] = managed[k](step)
         except EmptyChannelError:
             return
     elif isinstance(proc.channels, list):
diff --git a/libs/langgraph/tests/test_pregel.py b/libs/langgraph/tests/test_pregel.py
index 5c521f45c..31484cfe3 100644
--- a/libs/langgraph/tests/test_pregel.py
+++ b/libs/langgraph/tests/test_pregel.py
@@ -294,7 +294,6 @@ def test_node_schemas_custom_output() -> None:
     def node_b(state: StateForB):
         assert state == {
             "bye": "world",
-            "now": None,
         }
         return {
             "now": 123,
@@ -6364,11 +6363,7 @@ def test_in_one_fan_out_out_one_graph_state() -> None:
                 "payload": {
                     "id": "592f3430-c17c-5d1c-831f-fecebb2c05bf",
                     "name": "rewrite_query",
-                    "input": {
-                        "query": "what is weather in sf",
-                        "answer": None,
-                        "docs": [],
-                    },
+                    "input": {"query": "what is weather in sf", "docs": []},
                     "triggers": ["start:rewrite_query"],
                 },
             },
@@ -6399,11 +6394,7 @@ def test_in_one_fan_out_out_one_graph_state() -> None:
                 "payload": {
                     "id": "7db5e9d8-e132-5079-ab99-ced15e67d48b",
                     "name": "retriever_one",
-                    "input": {
-                        "query": "query: what is weather in sf",
-                        "answer": None,
-                        "docs": [],
-                    },
+                    "input": {"query": "query: what is weather in sf", "docs": []},
                     "triggers": ["rewrite_query"],
                 },
             },
@@ -6417,11 +6408,7 @@ def test_in_one_fan_out_out_one_graph_state() -> None:
                 "payload": {
                     "id": "96965ed0-2c10-52a1-86eb-081ba6de73b2",
                     "name": "retriever_two",
-                    "input": {
-                        "query": "query: what is weather in sf",
-                        "answer": None,
-                        "docs": [],
-                    },
+                    "input": {"query": "query: what is weather in sf", "docs": []},
                     "triggers": ["rewrite_query"],
                 },
             },
@@ -6482,7 +6469,6 @@ def test_in_one_fan_out_out_one_graph_state() -> None:
                     "name": "qa",
                     "input": {
                         "query": "query: what is weather in sf",
-                        "answer": None,
                         "docs": ["doc1", "doc2", "doc3", "doc4"],
                     },
                     "triggers": ["retriever_one", "retriever_two"],
@@ -8906,9 +8892,7 @@ def test_nested_graph_state(
             },
             metadata={
                 "source": "input",
-                "writes": {
-                    "__start__": {"my_key": "hi my value", "other_parent_key": None}
-                },
+                "writes": {"__start__": {"my_key": "hi my value"}},
                 "step": -1,
                 "parents": {"": AnyStr()},
             },
diff --git a/libs/langgraph/tests/test_pregel_async.py b/libs/langgraph/tests/test_pregel_async.py
index 764c31117..2f03a546e 100644
--- a/libs/langgraph/tests/test_pregel_async.py
+++ b/libs/langgraph/tests/test_pregel_async.py
@@ -570,7 +570,6 @@ async def test_node_schemas_custom_output() -> None:
     async def node_b(state: StateForB):
         assert state == {
             "bye": "world",
-            "now": None,
         }
         return {
             "now": 123,
@@ -4987,11 +4986,7 @@ async def test_in_one_fan_out_out_one_graph_state() -> None:
                 "payload": {
                     "id": "592f3430-c17c-5d1c-831f-fecebb2c05bf",
                     "name": "rewrite_query",
-                    "input": {
-                        "query": "what is weather in sf",
-                        "answer": None,
-                        "docs": [],
-                    },
+                    "input": {"query": "what is weather in sf", "docs": []},
                     "triggers": ["start:rewrite_query"],
                 },
             },
@@ -5022,11 +5017,7 @@ async def test_in_one_fan_out_out_one_graph_state() -> None:
                 "payload": {
                     "id": "7db5e9d8-e132-5079-ab99-ced15e67d48b",
                     "name": "retriever_one",
-                    "input": {
-                        "query": "query: what is weather in sf",
-                        "answer": None,
-                        "docs": [],
-                    },
+                    "input": {"query": "query: what is weather in sf", "docs": []},
                     "triggers": ["rewrite_query"],
                 },
             },
@@ -5040,11 +5031,7 @@ async def test_in_one_fan_out_out_one_graph_state() -> None:
                 "payload": {
                     "id": "96965ed0-2c10-52a1-86eb-081ba6de73b2",
                     "name": "retriever_two",
-                    "input": {
-                        "query": "query: what is weather in sf",
-                        "answer": None,
-                        "docs": [],
-                    },
+                    "input": {"query": "query: what is weather in sf", "docs": []},
                     "triggers": ["rewrite_query"],
                 },
             },
@@ -5105,7 +5092,6 @@ async def test_in_one_fan_out_out_one_graph_state() -> None:
                     "name": "qa",
                     "input": {
                         "query": "query: what is weather in sf",
-                        "answer": None,
                         "docs": ["doc1", "doc2", "doc3", "doc4"],
                     },
                     "triggers": ["retriever_one", "retriever_two"],
@@ -7403,9 +7389,7 @@ async def test_nested_graph_state(
             },
             metadata={
                 "source": "input",
-                "writes": {
-                    "__start__": {"my_key": "hi my value", "other_parent_key": None}
-                },
+                "writes": {"__start__": {"my_key": "hi my value"}},
                 "step": -1,
                 "parents": {"": AnyStr()},
             },