Merge branch 'moreUpgrading' into dataViz-annotations

1 files changed, 1 insertions, 1 deletions

diff --git a/src/client/util/History.ts b/src/client/util/History.ts
index 18aee6444..2f1a336cc 100644
--- a/src/client/util/History.ts
+++ b/src/client/util/History.ts
@@ -85,7 +85,7 @@ export namespace HistoryUtil {
     };
 
     function addParser(type: string, requiredFields: Parser, optionalFields: Parser, customParser?: (pathname: string[], opts: qs.ParsedQuery, current: ParsedUrl) => ParsedUrl | null | undefined) {
-        function parse(parser: ParserValue, value: string | string[] | null | undefined) {
+        function parse(parser: ParserValue, value: string | (string | null)[] | null | undefined) {
             if (value === undefined || value === null) {
                 return value;
             }