diff -ru a/R/soc.R b/R/soc.R
--- a/R/soc.R	2026-09-29 10:31:31
+++ b/R/soc.R	2026-09-29 10:31:31
@@ -231,7 +231,7 @@
   
   annual_change_carbon_stocks_trees_non_feed <- data.frame(type = "trees_non_feed") %>%
     dplyr::mutate(
-      biomass = sum(biomass[["trees_non_feed_biomass"]]$c_increase_soc),
+      biomass = sum(biomass$c_increase_soc, na.rm = TRUE),
       below_ground = biomass,
       annual_change_carbon_stocks = below_ground
     )
@@ -248,4 +248,4 @@
   )
   
   return(results)
-}
\ No newline at end of file
+}