diff --git a/src/strands/multiagent/graph.py b/src/strands/multiagent/graph.py
index 04d158108..29a51a0bb 100644
--- a/src/strands/multiagent/graph.py
+++ b/src/strands/multiagent/graph.py
@@ -189,7 +189,7 @@ def reset_executor_state(self) -> None:
         if hasattr(self.executor, "messages"):
             self.executor.messages = copy.deepcopy(self._initial_messages)
 
-        if hasattr(self.executor, "state"):
+        if hasattr(self.executor, "state") and hasattr(self.executor.state, "get"):
             self.executor.state = AgentState(self._initial_state.get())
 
         # Reset execution status
diff --git a/tests/strands/multiagent/test_graph.py b/tests/strands/multiagent/test_graph.py
index e978701cd..5ef825b39 100644
--- a/tests/strands/multiagent/test_graph.py
+++ b/tests/strands/multiagent/test_graph.py
@@ -2476,3 +2476,35 @@ def test_find_newly_ready_nodes_only_evaluates_outbound_edges():
     ready = graph._find_newly_ready_nodes([node_d])
     ready_ids = {n.node_id for n in ready}
     assert ready_ids == {"E"}, f"Expected only E, got {ready_ids}"
+
+
+@pytest.mark.asyncio
+async def test_reset_executor_state_preserves_graph_state_for_nested_graph():
+    """Verify reset_executor_state does not corrupt MultiAgentBase state.
+
+    When a GraphNode wraps a MultiAgentBase executor (e.g. a nested Graph),
+    reset_executor_state() must not overwrite GraphState with AgentState.
+    Regression test for #1775.
+    """
+    inner_agent = create_mock_agent("inner", "inner response")
+    inner_builder = GraphBuilder()
+    inner_builder.add_node(inner_agent, "inner_node")
+    inner_builder.set_entry_point("inner_node")
+    inner_graph = inner_builder.build()
+
+    # inner_graph.state is a GraphState, not AgentState
+    assert isinstance(inner_graph.state, GraphState)
+
+    node = GraphNode(node_id="nested", executor=inner_graph)
+
+    # Simulate a completed execution
+    node.execution_status = Status.COMPLETED
+    node.result = NodeResult(result=MagicMock(), status=Status.COMPLETED)
+
+    # Reset should NOT corrupt the nested graph's state
+    node.reset_executor_state()
+
+    # After reset, the executor's state must still be GraphState
+    assert isinstance(inner_graph.state, GraphState), "reset_executor_state overwrote GraphState with AgentState"
+    assert node.execution_status == Status.PENDING
+    assert node.result is None