From bc986fa887c8e603680ff16fa3e4869b79ef6667 Mon Sep 17 00:00:00 2001
From: Alexander Bock <alexander.bock@liu.se>
Date: Mon, 11 Dec 2023 13:57:07 +0100
Subject: [PATCH] Gracefully deal with empty ossync files in UrlSynchronization

---
 modules/sync/syncs/urlsynchronization.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/modules/sync/syncs/urlsynchronization.cpp b/modules/sync/syncs/urlsynchronization.cpp
index ca0fda73f5..df3b67acd4 100644
--- a/modules/sync/syncs/urlsynchronization.cpp
+++ b/modules/sync/syncs/urlsynchronization.cpp
@@ -210,7 +210,7 @@ bool UrlSynchronization::isEachFileValid() {
         file.close();
         createSyncFile();
         // File is valid until some date
-        return true; 
+        return true;
     }
     // Otherwise first line is the version number.
     std::string ossyncVersion = line;
@@ -244,6 +244,10 @@ bool UrlSynchronization::isEachFileValid() {
         // i.e. no sync needed.
         return fileValidAsJ2000 > todaysDateAsJ2000;
     }
+    else if (ossyncVersion.empty()) {
+        // For some reason we ended up with an empty synchronization file
+        return false;
+    }
     else {
         LERROR(fmt::format(
             "{}: Unknown ossync version number read. Got {} while {} and below are valid",