diff --git a/admin/tool/log/backup/moodle2/restore_tool_log_logstore_subplugin.class.php b/admin/tool/log/backup/moodle2/restore_tool_log_logstore_subplugin.class.php
index 7901ef02f06..0c00f00880a 100644
--- a/admin/tool/log/backup/moodle2/restore_tool_log_logstore_subplugin.class.php
+++ b/admin/tool/log/backup/moodle2/restore_tool_log_logstore_subplugin.class.php
@@ -105,7 +105,8 @@ abstract class restore_tool_log_logstore_subplugin extends restore_subplugin {
                         ($mapping['restore'] === \core\event\base::NOT_MAPPED)) {
                         $data->objectid = \core\event\base::NOT_MAPPED;
                     } else {
-                        $data->objectid = $this->get_mappingid($mapping['restore'], $data->objectid);
+                        $data->objectid = $this->get_mappingid($mapping['restore'], $data->objectid,
+                            \core\event\base::NOT_FOUND);
                     }
                 }
             } else {
@@ -131,7 +132,8 @@ abstract class restore_tool_log_logstore_subplugin extends restore_subplugin {
                                 ($mapping['restore'] === \core\event\base::NOT_MAPPED)) {
                                 $data->other[$key] = \core\event\base::NOT_MAPPED;
                             } else {
-                                $data->other[$key] = $this->get_mappingid($mapping['restore'], $value);
+                                $data->other[$key] = $this->get_mappingid($mapping['restore'], $value,
+                                    \core\event\base::NOT_FOUND);
                             }
                         }
                     }
diff --git a/lib/classes/event/base.php b/lib/classes/event/base.php
index 88685a4e115..17d399b6286 100644
--- a/lib/classes/event/base.php
+++ b/lib/classes/event/base.php
@@ -80,6 +80,11 @@ abstract class base implements \IteratorAggregate {
      */
     const NOT_MAPPED = -31337;
 
+    /**
+     * The value used when an id can not be found during a restore.
+     */
+    const NOT_FOUND = -31338;
+
     /** @var array event data */
     protected $data;