diff --git a/lib/manticore/client.rb b/lib/manticore/client.rb
index bdc68c2..6082416 100644
--- a/lib/manticore/client.rb
+++ b/lib/manticore/client.rb
@@ -754,7 +754,7 @@ def setup_key_store(ssl_options, context)
     def get_store(prefix, options)
       KeyStore.get_instance(options[:"#{prefix}_type"] || guess_store_type(options[prefix])).tap do |store|
         instream = open(options[prefix], "rb").to_inputstream
-        store.load(instream, options.fetch(:"#{prefix}_password", nil).to_java.toCharArray)
+        store.load(instream, options.fetch(:"#{prefix}_password", nil).to_java&.toCharArray)
       end
     end