Index: lib/filelib.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- lib/filelib.php	(revision 43caa6209d6274f220beaa81540ebee47610b5fa)
+++ lib/filelib.php	(revision )
@@ -1908,13 +1908,16 @@
             $fs = get_file_storage();
             if ($fs->xsendfile($file->get_contenthash())) {
                 return;
-            }
-
+            } else {
+				send_file_not_found();
+			}
         } else {
             require_once("$CFG->libdir/xsendfilelib.php");
             if (xsendfile($file)) {
                 return;
-            }
+            } else {
+            	send_file_not_found();
+			}
         }
     }