Issue #3308354 by Tim Bozeman: Set a default variant delta

modules/location_variant/src/EntityLocationHandler.php

@@ -497,6 +497,10 @@ class EntityLocationHandler extends EntityHandlerBase {
     else {
       $delta = \count($variants);
     }
+    if (!isset($delta)) {
+      // Let's set a default delta in the case we can't find one such as listing variations in another workspace.
+      $delta = 0;
+    }
     return "$langcode-$delta";
   }