From b3c9595e3ca84961d86966c9ff3ddaa22cdc4b6d Mon Sep 17 00:00:00 2001
From: Marten Lohstroh <marten@berkeley.edu>
Date: Tue, 15 Aug 2023 16:31:10 -0700
Subject: [PATCH] Update src/core/graph.ts

Co-authored-by: Byeong-gil Jun <78055940+byeong-gil@users.noreply.github.com>
---
 src/core/graph.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/core/graph.ts b/src/core/graph.ts
index db2190e1..3a3a72ae 100644
--- a/src/core/graph.ts
+++ b/src/core/graph.ts
@@ -397,7 +397,9 @@ export class SortablePrecedenceGraph<
       } else {
         // Look further upstream for start nodes that match the type.
         for (const newStartNode of pg.getDownstreamNeighbors(node)) {
-          startNodes.add(newStartNode);
+          if (!visited.has(newStartNode)) {
+            startNodes.add(newStartNode);
+          }
         }
       }
     }