diff --git a/R/couplingMap.R b/R/couplingMap.R
index 4b287150..7298b79e 100644
--- a/R/couplingMap.R
+++ b/R/couplingMap.R
@@ -108,7 +108,7 @@ couplingMap <- function(M, analysis = "documents", field="CR", n=500, label.term
   df <- df_lab %>%
     mutate(centrality = mean(.data$pagerank_centrality),
            impact = mean(.data$MNLCS2,na.rm=TRUE),
-           impact = replace(.data$impact, is.na(.data$impact),NA)) %>%
+           impact = replace(.data$impact, is.na(.data$impact),0)) %>%
     top_n(.data$MNLCS, n=10) %>%
     summarize(freq = .data$freq[1],
               centrality = .data$centrality[1]*100,
@@ -132,6 +132,9 @@ couplingMap <- function(M, analysis = "documents", field="CR", n=500, label.term
   meancentr <- mean(df$rcentrality)
   df <- df[df$freq>=minfreq,]
   
+  df_lab<- df_lab %>% 
+    dplyr::filter(.data$group %in% df$group)
+  
   rangex <- max(c(meancentr-min(df$rcentrality),max(df$rcentrality)-meancentr))
   rangey <- max(c(meandens-min(df$rimpact),max(df$rimpact)-meandens))
   xlimits <- c(meancentr-rangex-0.5,meancentr+rangex+0.5)
@@ -156,7 +159,7 @@ couplingMap <- function(M, analysis = "documents", field="CR", n=500, label.term
   x <- c(max(df$rcentrality)-0.02-diff(range(df$rcentrality))*0.125, max(df$rcentrality)-0.02)+0.5
   y <- c(min(df$rimpact),min(df$rimpact)+diff(range(df$rimpact))*0.125)
   
-  g=ggplot(df, aes(x=.data$rcentrality, y=.data$rimpact, text=(.data$words))) +
+  g <- ggplot(df, aes(x=.data$rcentrality, y=.data$rimpact, text=(.data$words))) +
     geom_point(group="NA",aes(size=log(as.numeric(.data$freq))),shape=20,col=adjustcolor(df$color,alpha.f=0.5))     # Use hollow circles
   if (size>0){
     if (isTRUE(repel)){
diff --git a/R/tableTag.R b/R/tableTag.R
index 533ab668..a8c0e8af 100644
--- a/R/tableTag.R
+++ b/R/tableTag.R
@@ -29,7 +29,7 @@ tableTag <- function(M, Tag = "CR", sep = ";", ngrams=1){
     M$C1=gsub("\\[.+?]","",M$C1) 
   }
   
-  Tab<-unlist(strsplit(as.character(M[,i]),sep))
+  Tab<-unlist(strsplit(as.character(M %>% dplyr::pull(i)),sep))
   
   ### inserted to remove punct and extra spaces ####
   #Tab<-trimws(trimES(gsub("[[:punct:]]"," ",Tab)))
diff --git a/inst/biblioshiny/ui.R b/inst/biblioshiny/ui.R
index 19fe3824..7c17a8eb 100644
--- a/inst/biblioshiny/ui.R
+++ b/inst/biblioshiny/ui.R
@@ -1850,7 +1850,7 @@ navbarMenu("Documents",
 ),
 
 ### COUPLING ----
-navbarMenu("Coupling ",
+navbarMenu("Clustering ",
            
            #### Coupling ----
            "  ",