Empty migration_dependencies gives "Unsupported operand types"

I am running into this issue:

codio@total-patrol:~/workspace/motionsplan.dk/web$ drush migrate-status                            
PHP Fatal error:  Unsupported operand types in /home/codio/workspace/motionsplan.dk/web/core/module
s/migrate/src/Plugin/Migration.php on line 665                                                     
Drush command terminated abnormally due to an unrecoverable error.                      [error]    
Error: Unsupported operand types in                                                                
/home/codio/workspace/motionsplan.dk/web/core/modules/migrate/src/Plugin/Migration.php,            
line 665 

I am using these version:

"require": {
  "drupal/migrate": "8.1.*",
  "drupal/migrate_plus": "8.2.*",
  "drupal/migrate_tools": "8.2.*",
  "drupal/migrate_source_csv": "8.2.*",
}
   "patches": {
      "drupal/migrate_tools": {
        "Issue #2697923 Make migration UI work with 8.1.x": "https://www.drupal.org/files/issues/2697923-add-migration-ui-4.patch"
      }
  }