diff --git a/subworkflows/local/bam_variant_calling_somatic_mutect2/main.nf b/subworkflows/local/bam_variant_calling_somatic_mutect2/main.nf
index 8429cc7e35..2184e1b187 100644
--- a/subworkflows/local/bam_variant_calling_somatic_mutect2/main.nf
+++ b/subworkflows/local/bam_variant_calling_somatic_mutect2/main.nf
@@ -31,7 +31,7 @@ workflow BAM_VARIANT_CALLING_SOMATIC_MUTECT2 {
     versions = Channel.empty()
 
     //If no germline resource is provided, then create an empty channel to avoid GetPileupsummaries from being run
-    germline_resource_pileup     = germline_resource_tbi ? germline_resource ?: Channel.empty()
+    germline_resource_pileup     = germline_resource_tbi ? germline_resource ?: Channel.empty() : Channel.empty()
     germline_resource_pileup_tbi = germline_resource_tbi ?: Channel.empty()
 
     // Combine input and intervals for spread and gather strategy