From 393c0c74a91175adca2e25026dcdb9e6445afd8f Mon Sep 17 00:00:00 2001
From: Richard Moore <github@ricmoo.com>
Date: Tue, 28 Apr 2020 04:52:29 -0400
Subject: [PATCH] Fixed getLogs filter deserialization (#805).

---
 packages/providers/src.ts/base-provider.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/providers/src.ts/base-provider.ts b/packages/providers/src.ts/base-provider.ts
index 7e96217d..8463343e 100644
--- a/packages/providers/src.ts/base-provider.ts
+++ b/packages/providers/src.ts/base-provider.ts
@@ -50,6 +50,7 @@ function serializeTopics(topics: Array<string | Array<string>>): string {
             sorted.sort();
 
             return sorted.join("|");
+
         } else {
             return checkTopic(topic);
         }
@@ -58,10 +59,15 @@ function serializeTopics(topics: Array<string | Array<string>>): string {
 
 function deserializeTopics(data: string): Array<string | Array<string>> {
     if (data === "") { return [ ]; }
+
     return data.split(/&/g).map((topic) => {
-        return topic.split("|").map((topic) => {
+        if (topic === "") { return [ ]; }
+
+        const comps = topic.split("|").map((topic) => {
             return ((topic === "null") ? null: topic);
         });
+
+        return ((comps.length === 1) ? comps[0]: comps);
     });
 }