diff --git a/src/dash/utils/TimelineConverter.js b/src/dash/utils/TimelineConverter.js
index cc60612ae1..0848d07384 100644
--- a/src/dash/utils/TimelineConverter.js
+++ b/src/dash/utils/TimelineConverter.js
@@ -341,7 +341,7 @@ function TimelineConverter() {
     }
 
     function _onUpdateTimeSyncOffset(e) {
-        if (e.offset !== undefined) {
+        if (e.offset !== undefined && !isNaN(e.offset)) {
             setClientTimeOffset(e.offset / 1000);
         }
     }
diff --git a/src/streaming/controllers/TimeSyncController.js b/src/streaming/controllers/TimeSyncController.js
index 798d349098..f300a4e4ab 100644
--- a/src/streaming/controllers/TimeSyncController.js
+++ b/src/streaming/controllers/TimeSyncController.js
@@ -547,6 +547,7 @@ function TimeSyncController() {
 
         if (failed) {
             lastTimingSource = null;
+            isSynchronizing = false;
             errHandler.error(new DashJSError(Errors.TIME_SYNC_FAILED_ERROR_CODE, Errors.TIME_SYNC_FAILED_ERROR_MESSAGE));
         }