diff --git a/nextflow.config b/nextflow.config
index 3476ef7..cd1798e 100644
--- a/nextflow.config
+++ b/nextflow.config
@@ -80,7 +80,9 @@ params {
     show_hidden                  = false
     version                      = false
     pipelines_testdata_base_path = 'https://raw.githubusercontent.com/nf-core/test-datasets/'
-    trace_report_suffix          = new java.util.Date().format( 'yyyy-MM-dd_HH-mm-ss')// Config options
+    trace_report_suffix          = new java.util.Date().format( 'yyyy-MM-dd_HH-mm-ss')
+    
+    // Config options
     config_profile_name        = null
     config_profile_description = null
 
@@ -312,7 +314,8 @@ validation {
 \033[0;35m  nf-core/scnanoseq ${manifest.version}\033[0m
 -\033[2m----------------------------------------------------\033[0m-
 """
-        afterText = """${manifest.doi ? "\n* The pipeline\n" : ""}${manifest.doi.tokenize(",").collect { "    https://doi.org/${it.trim().replace('https://doi.org/','')}"}.join("\n")}${manifest.doi ? "\n" : ""}
+        afterText = """${manifest.doi ? "\n* The pipeline\n" : ""}${manifest.doi.tokenize(",").collect { doi -> "    https://doi.org/${doi.trim().replace('https://doi.org/','')}"}.join("\n")}${manifest.doi ? "\n" : ""}
+
 * The nf-core framework
     https://doi.org/10.1038/s41587-020-0439-x