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-rw-r--r--pkgs/development/interpreters/ruby/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/interpreters/ruby/default.nix b/pkgs/development/interpreters/ruby/default.nix
index 9ec7a448b59f7..8aed134441985 100644
--- a/pkgs/development/interpreters/ruby/default.nix
+++ b/pkgs/development/interpreters/ruby/default.nix
@@ -125,7 +125,7 @@ let
         cargoDeps = if yjitSupport then rustPlatform.fetchCargoTarball {
           inherit (finalAttrs) src;
           sourceRoot = "${finalAttrs.pname}-${version}/${finalAttrs.cargoRoot}";
-          hash = cargoHash;
+          hash = assert cargoHash != null; cargoHash;
         } else null;
 
         postUnpack = opString rubygemsSupport ''