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-rw-r--r--tools/gridss-computeSamTags.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/gridss-computeSamTags.nix b/tools/gridss-computeSamTags.nix
index 5b19a3a..ebcc5b8 100644
--- a/tools/gridss-computeSamTags.nix
+++ b/tools/gridss-computeSamTags.nix
@@ -35,7 +35,7 @@ stdenv.mkDerivation rec {
REFERENCE_SEQUENCE=ref.fa \
WORKING_DIR=$TMP_DIR \
TMP_DIR=$TMP_DIR \
- ${optionalString config ("CONFIGURATION_FILE=" + gridssConfig config)} \
+ ${optionalString (config != null) ("CONFIGURATION_FILE=" + gridssConfig config)} \
I=${input} \
O=$out \
AS=true