diff --git a/lib/dash/dash_parser.js b/lib/dash/dash_parser.js
index c407e16be2..42092f43a0 100644
--- a/lib/dash/dash_parser.js
+++ b/lib/dash/dash_parser.js
@@ -1500,6 +1500,9 @@ shaka.dash.DashParser = class {
       let shouldDeleteIndex = true;
       for (const contextId of this.indexStreamMap_[pId]) {
         const stream = this.streamMap_[contextId];
+        if (!stream) {
+          continue;
+        }
         if (stream.segmentIndex && !stream.segmentIndex.isEmpty()) {
           shouldDeleteIndex = false;
           continue;