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-rw-r--r--tools/gridss-identifyVariants.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/gridss-identifyVariants.nix b/tools/gridss-identifyVariants.nix
index 16982e2..87d418b 100644
--- a/tools/gridss-identifyVariants.nix
+++ b/tools/gridss-identifyVariants.nix
@@ -61,7 +61,7 @@ stdenv.mkDerivation rec {
${concatMapStringsSep " " (i: "INPUT='${i}'") inputs} \
ASSEMBLY=${assembly} \
OUTPUT_VCF=out.vcf \
- ${optionalString config ("CONFIGURATION_FILE=" + gridssConfig config)} \
+ ${optionalString (config != null) ("CONFIGURATION_FILE=" + gridssConfig config)} \
WORKING_DIR=$TMPDIR/ \
TMP_DIR=$TMPDIR/