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-rw-r--r--tools/gridss-annotateVariants.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/gridss-annotateVariants.nix b/tools/gridss-annotateVariants.nix
index 33992c4..4422cd6 100644
--- a/tools/gridss-annotateVariants.nix
+++ b/tools/gridss-annotateVariants.nix
@@ -65,7 +65,7 @@ stdenv.mkDerivation rec {
INPUT_VCF=input.vcf \
OUTPUT_VCF=out.vcf \
WORKING_DIR=$TMPDIR/ \
- ${optionalString config ("CONFIGURATION_FILE=" + gridssConfig config)} \
+ ${optionalString (config != null) ("CONFIGURATION_FILE=" + gridssConfig config)} \
TMP_DIR=$TMPDIR/
mv out.vcf $out