diff --git a/src/main/java/com/googlesource/gerrit/plugins/websession/flatfile/FlatFileWebSessionCache.java b/src/main/java/com/googlesource/gerrit/plugins/websession/flatfile/FlatFileWebSessionCache.java
index eefdd86..11e5b78 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/websession/flatfile/FlatFileWebSessionCache.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/websession/flatfile/FlatFileWebSessionCache.java
@@ -227,7 +227,7 @@
   }
 
   private void deleteFile(File f) {
-    if (!f.delete()) {
+    if (f.exists() && !f.delete()) {
       log.warn("Cannot delete file " + f.getName() + " from cache "
           + dir.getAbsolutePath());
     }