diff --git a/lib/mu_search/index_manager.rb b/lib/mu_search/index_manager.rb
index e69a59b..28eef17 100644
--- a/lib/mu_search/index_manager.rb
+++ b/lib/mu_search/index_manager.rb
@@ -217,7 +217,7 @@ def ensure_index_combination_for_groups(type_name, allowed_groups, used_groups =
           end
         end
       end
-      indexes = @indexes[type_name].values.find_all(&:eager_index?)
+      indexes = @indexes[type_name]&.values&.find_all(&:eager_index?) || []
       @logger.debug("INDEX MGMT") { "Currently known indexes for type '#{type_name}': #{indexes.map(&:allowed_groups).to_json}" }
       # Find all indexes with allowed_groups that are a subset of the given allowed_groups
       matching_indexes = indexes.find_all do |idx|