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-rw-r--r--nix/libstore/build.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index e72fb50d8e..be19dd8b61 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -1451,7 +1451,8 @@ void DerivationGoal::buildDone()
         outputLocks.unlock();
 
     } catch (BuildError & e) {
-        printMsg(lvlError, e.msg());
+        if (!hook)
+            printMsg(lvlError, e.msg());
         outputLocks.unlock();
         buildUser.release();