diff --git a/modules/docker.nix b/modules/docker.nix
index c033dff..7a35af4 100644
--- a/modules/docker.nix
+++ b/modules/docker.nix
@@ -34,13 +34,13 @@ in {
           name = mkOption {
             description = "Desired docker image name";
             type = types.str;
-            default = builtins.unsafeDiscardStringContext config.image.imageName;
+            default = if config.image != null then builtins.unsafeDiscardStringContext config.image.imageName else "";
           };
 
           tag = mkOption {
             description = "Desired docker image tag";
             type = types.str;
-            default = builtins.unsafeDiscardStringContext config.image.imageTag;
+            default = if config.image != null then builtins.unsafeDiscardStringContext config.image.imageTag else "";
           };
 
           registry = mkOption {