error:
       … while evaluating the attribute 'optionalValue.value'
         at «github:nix-community/nixpkgs.lib/db3f255737b94216eb71cce308e2912cf6bc2d7c?narHash=sha256-ePjCwr1sNm9NYUqywL7QfK3JnlS015msC%2BeBu2zKlp8%3D»/lib/modules.nix:1310:5:
         1309|
         1310|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |     ^
         1311|   };

       … while evaluating a branch condition
         at «github:nix-community/nixpkgs.lib/db3f255737b94216eb71cce308e2912cf6bc2d7c?narHash=sha256-ePjCwr1sNm9NYUqywL7QfK3JnlS015msC%2BeBu2zKlp8%3D»/lib/modules.nix:1310:21:
         1309|
         1310|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |                     ^
         1311|   };

       … while evaluating definitions from `/nix/store/a44xppjsnb0q07pp6z1zjnqjmai0fmbi-source/systems/andromeda':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: Failed to fetch git repository 'ssh://git@git.o-g.at/nixpkg/tuxpkgs.git'