Output path comparison

nix-env failed:
warning: ignoring the user-specified setting 'restrict-eval', because it is a restricted setting and you are not a trusted user
error: while evaluating anonymous function at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/.gc-of-borg-outpaths.nix:44:12, called from undefined position:
while evaluating anonymous function at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/pkgs/top-level/release-lib.nix:121:6, called from /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/lib/attrsets.nix:310:43:
while evaluating 'hydraJob' at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/lib/customisation.nix:171:14, called from /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/pkgs/top-level/release-lib.nix:121:14:
while evaluating the attribute 'drvPath' at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/lib/customisation.nix:188:13:
while evaluating the attribute 'drvPath' at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/lib/customisation.nix:155:13:
while evaluating the attribute 'preBuild' of the derivation 'mobilizon-1.1.0' at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/pkgs/stdenv/generic/make-derivation.nix:197:11:
while evaluating the derivation attribute 'name' at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix:290:7:
while evaluating 'unlessNull' at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix:19:22, called from /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix:242:18:
while evaluating 'reformatPackageName' at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix:22:25, called from /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix:240:18:
while evaluating 'importJSON' at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/lib/trivial.nix:281:16, called from /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix:238:17:
cannot read '/nix/store/a93wi949l9qzgkp2dw17vaw89wngvhz1-mobilizon-js-src/package.json', since path '/nix/store/bpp4rjg0bmk1wcx8hfaql53nkz39lqlv-mobilizon-js-src.drv' is not valid, at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/ofborg-evaluator-6/lib/trivial.nix:282:24