diff --git a/src/Jenssegers/Mongodb/Eloquent/Builder.php b/src/Jenssegers/Mongodb/Eloquent/Builder.php
index 2c108e8788df77d6e085e209440e6d4e64443794..7ee6722d1e380c679d96155ff40763fc898af9d6 100644
--- a/src/Jenssegers/Mongodb/Eloquent/Builder.php
+++ b/src/Jenssegers/Mongodb/Eloquent/Builder.php
@@ -150,7 +150,7 @@ class Builder extends EloquentBuilder
         $relations = $query->pluck($relation->getHasCompareKey());
         $relationCount = array_count_values(array_map(function ($id) {
             return (string) $id; // Convert Back ObjectIds to Strings
-        }, is_array($relations) ? $relations : $relations->toArray()));
+        }, is_array($relations) ? $relations : $relations->flatten()->toArray()));
 
         // Remove unwanted related objects based on the operator and count.
         $relationCount = array_filter($relationCount, function ($counted) use ($count, $operator) {