diff --git a/workflow/scripts/report/af_time_correlation_data.R b/workflow/scripts/report/af_time_correlation_data.R
index e95abff..64ad974 100644
--- a/workflow/scripts/report/af_time_correlation_data.R
+++ b/workflow/scripts/report/af_time_correlation_data.R
@@ -63,6 +63,8 @@ unique.snps <- unique(variants$VARIANT_NAME)
 # Create an empty dataframe to be filled
 cor.df <- data.frame(
   variant = "",
+  min_af = 0,
+  max_af = 0,
   coefficient = 0,
   p.value = 0,
   p.value.adj = 0