From 70bae29fa673d93cece0b59b9112ab3373ae002f Mon Sep 17 00:00:00 2001
From: forest93 <forest93@163.com>
Date: Mon, 30 Jul 2018 14:43:25 +0800
Subject: [PATCH] Fixed System.ArgumentException for Flow boards without
 pagination. Accessed JArray values with invalid key value: "fwd". Int32 array
 index expected.

---
 WikiClientLibrary.Flow/Board.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/WikiClientLibrary.Flow/Board.cs b/WikiClientLibrary.Flow/Board.cs
index d1dee2208..f9db92582 100644
--- a/WikiClientLibrary.Flow/Board.cs
+++ b/WikiClientLibrary.Flow/Board.cs
@@ -127,7 +127,11 @@ public IAsyncEnumerable<Topic> EnumTopicsAsync(TopicListingOptions options, int
                 var jresult = await Site.InvokeMediaWikiApiAsync(new MediaWikiFormRequestMessage(queryParams), ct);
                 var jtopiclist = (JObject)jresult["flow"]["view-topiclist"]["result"]["topiclist"];
                 await sink.YieldAndWait(Topic.FromJsonTopicList(Site, jtopiclist));
-                var nextPageUrl = (string)jtopiclist["links"]?["pagination"]?["fwd"]?["url"];
+                // 2018-07-30 flow.view-topiclist.result.topiclist.links.pagination is [] instead of null for boards without pagination.
+                var jpagination = jtopiclist["links"]?["pagination"];
+                var nextPageUrl = jpagination == null || jpagination is JArray 
+                    ? null 
+                    : (string) jpagination["fwd"]?["url"];
                 if (nextPageUrl != null)
                 {
                     var urlParams = FlowUtility.ParseUrlQueryParametrs(nextPageUrl);