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-rw-r--r--tools/gridss-callVariants.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/gridss-callVariants.nix b/tools/gridss-callVariants.nix
index dc978fa..9afaf65 100644
--- a/tools/gridss-callVariants.nix
+++ b/tools/gridss-callVariants.nix
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
WORKER_THREADS=$NIX_BUILD_CORES \
TMP_DIR=. \
WORKING_DIR=. \
- ${optionalString config ("CONFIGURATION_FILE=" + gridssConfig config)} \
+ ${optionalString (config != null) ("CONFIGURATION_FILE=" + gridssConfig config)} \
REFERENCE_SEQUENCE="ref.fa" \
${concatMapStringsSep " " (i: "INPUT=\"${i}\"") inputs} \
OUTPUT="$out/gridss.vcf" \