diff --git a/R/plot_mgt_harv.R b/R/plot_mgt_harv.R
index 52db5c8149b0543c353595f628c030c042517e9b..c4f6a939caa1c00b0c85bdc7e185f873773db29a 100644
--- a/R/plot_mgt_harv.R
+++ b/R/plot_mgt_harv.R
@@ -275,7 +275,7 @@ prepare_phu <- function(mgt_out, years) {
     ungroup() %>%
     filter(year %in% years)
 
-  if(any(phu_tbl$date_diff > 1)) {
+  if(any(phu_tbl$date_diff > 1, na.rm = TRUE)) {
     crop_diff <- phu_tbl %>%
       filter(operation == 'KILL') %>%
       filter(date_diff > 1) %>%