diff --git a/modules/nf-core/mobster/templates/main_script.R b/modules/nf-core/mobster/templates/main_script.R
index 1ed8499673e1..4042eb38bb63 100644
--- a/modules/nf-core/mobster/templates/main_script.R
+++ b/modules/nf-core/mobster/templates/main_script.R
@@ -91,7 +91,7 @@ lapply(samples, function(sample_name) {
     fit = run_mobster_fit(joint_table=input_table %>% dplyr::filter(sample_id == !!sample_name),
                           descr=paste(description, sample_name, sep=":"))
 
-    if (any(fit[["fits.table"]][["tail"]])) {
+    if (fit[["best"]][["fit.tail"]]) {
         evoparams = evolutionary_parameters(fit)
         fit[["evolutionary_parameters"]] = evoparams
         fit[["best"]][["evolutionary_parameters"]] = evoparams