MDL-38734: Automated backup failure causing all course to fail

backup/moodle2/backup_stepslib.php

@@ -37,6 +37,7 @@ class create_and_clean_temp_stuff extends backup_execution_step {
         backup_helper::check_and_create_backup_dir($this->get_backupid());// Create backup temp dir
         backup_helper::clear_backup_dir($this->get_backupid());           // Empty temp dir, just in case
         backup_helper::delete_old_backup_dirs(time() - (4 * 60 * 60));    // Delete > 4 hours temp dirs
+        backup_controller_dbops::drop_backup_ids_temp_table($this->get_backupid()); // Drop ids temp table
         backup_controller_dbops::create_backup_ids_temp_table($this->get_backupid()); // Create ids temp table
     }
 }

backup/util/dbops/backup_controller_dbops.class.php

@@ -164,8 +164,10 @@ abstract class backup_controller_dbops extends backup_dbops {
         $dbman = $DB->get_manager(); // We are going to use database_manager services
 
         $targettablename = 'backup_ids_temp';
-        $table = new xmldb_table($targettablename);
-        $dbman->drop_table($table); // And drop it
+        if ($dbman->table_exists($targettablename)) {
+            $table = new xmldb_table($targettablename);
+            $dbman->drop_table($table); // And drop it
+        }
     }
 
     /**