diff --git a/R/ggstats_add_xy.R b/R/ggstats_add_xy.R
index c5c4531..630d44e 100644
--- a/R/ggstats_add_xy.R
+++ b/R/ggstats_add_xy.R
@@ -10,11 +10,11 @@ ggstats_add_xy<-function(table_stat, table, xcol=NULL, group, y="max", bracket.o
   if (is.null(exclude_group)){
     table_agg<-table %>% group_by(.data[[x]])
   }else{
-    table_agg<-table %>% group_by(.data[[x]], .data[[exclude_group]])
+    table_agg<-table %>% group_by(.data[[x]], !!!syms(exclude_group))
   }
   if (y == "max"){
     agg<-table_agg %>% summarise(max=max(.data[[value.var]], na.rm = T))
-    if(!is.null(exclude_group)){agg<-table_agg %>% group_by(.data[[exclude_group]]) %>% summarise(max=max(.data[[value.var]], na.rm=T))}
+    if(!is.null(exclude_group)){agg<-table_agg %>% group_by(!!!syms(exclude_group)) %>% summarise(max=max(.data[[value.var]], na.rm=T))}
   }else if (y == "mean"){
     agg<-table %>% group_by(.data[[x]],.data[[group]]) %>% summarise(mean=mean(.data[[value.var]], na.rm=T)) %>% spread(group, mean)
     agg<- data.frame(x=agg[,1], "max"=apply(agg[,2:ncol(agg)], 1, max, na.rm=T))
@@ -55,7 +55,7 @@ ggstats_add_xy<-function(table_stat, table, xcol=NULL, group, y="max", bracket.o
     if (!is.null(exclude_group)){
       for (j in unique(pull(table_stat, all_of(exclude_group)))){
         for (dia in unique(pull(table_stat,all_of(xcol)))){
-          if (table_stat %>% filter(p < 0.05) %>% filter(.data[[x]] == dia & .data[[exclude_group]] == j) %>% nrow() > 0){
+          if (table_stat %>% filter(p < 0.05) %>% filter(.data[[x]] == dia & !!!syms(exclude_group) == j) %>% nrow() > 0){
             t[table_stat[,x] == dia & table_stat[,exclude_group] == j,"y.position"]<-seq(t[table_stat[,x] == dia & table_stat[,exclude_group] == j,"y.position"][[1,1]],
                                                                                          t[table_stat[,x] == dia & table_stat[,exclude_group] == j,"y.position"][[1,1]]+diff(range(table[,value.var], na.rm = T))*bracket.inspace*(nrow(table_stat[table_stat[,x] == dia & table_stat[,exclude_group] == j,])-1),
                                                                                          by=diff(range(table[,value.var], na.rm = T))*bracket.inspace)