diff --git a/config/initializers/blind_index.rb b/config/initializers/blind_index.rb
index 8ea72e3..647f6ab 100644
--- a/config/initializers/blind_index.rb
+++ b/config/initializers/blind_index.rb
@@ -1,3 +1,3 @@
 # frozen_string_literal: true
 
-BlindIndex.master_key = ENV.fetch("BLIND_INDEX_MASTER_KEY")
+BlindIndex.master_key = ENV["BLIND_INDEX_MASTER_KEY"] if ENV["BLIND_INDEX_MASTER_KEY"].present?
diff --git a/config/initializers/lockbox.rb b/config/initializers/lockbox.rb
index 7f89ac6..afefdfa 100644
--- a/config/initializers/lockbox.rb
+++ b/config/initializers/lockbox.rb
@@ -1,3 +1,3 @@
 # frozen_string_literal: true
 
-Lockbox.master_key = ENV.fetch("LOCKBOX_MASTER_KEY")
+Lockbox.master_key = ENV["LOCKBOX_MASTER_KEY"] if ENV["LOCKBOX_MASTER_KEY"].present?