diff --git a/extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java b/extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java
index 671db465d..23566f676 100644
--- a/extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java
+++ b/extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java
@@ -662,7 +662,7 @@ public class YoutubeStreamExtractor extends StreamExtractor {
             }
         }
 
-        return errorReason != null ? errorReason.toString() : null;
+        return errorReason != null ? errorReason.toString() : "";
     }
 
     /*//////////////////////////////////////////////////////////////////////////