--check: Fix "failed to produce output path"

This occured when sandbox building is disabled, at least one output
exists, and at least one other output does not.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index f776798b0c22..0b6a214efd32 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -2662,7 +2662,7 @@ void DerivationGoal::registerOutputs()
                 && redirectedBadOutputs.find(path) != redirectedBadOutputs.end()
                 && pathExists(redirected))
                 replaceValidPath(path, redirected);
-            if (buildMode == bmCheck)
+            if (buildMode == bmCheck && redirected != "")
                 actualPath = redirected;
         }