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-rw-r--r--tools/gridss-collectMetrics.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/gridss-collectMetrics.nix b/tools/gridss-collectMetrics.nix
index c1909f1..38bacc6 100644
--- a/tools/gridss-collectMetrics.nix
+++ b/tools/gridss-collectMetrics.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
mkdir $out
java -Xmx1G -cp ${bionix.gridss.jar} \
gridss.analysis.CollectGridssMetrics \
- ${optionalString config ("CONFIGURATION_FILE=" + gridssConfig config)} \
+ ${optionalString (config != null) ("CONFIGURATION_FILE=" + gridssConfig config)} \
I=${input}\
O=$out/input \
AS=true \