diff --git a/R/mix.R b/R/mix.R
index ebb916aadcc3c06cca5b852aa5835cfeb5ceecac..46634b3c1bf3bf717d070728192c29b69cb58925 100644
--- a/R/mix.R
+++ b/R/mix.R
@@ -574,7 +574,6 @@ vald_comp_tab<-function(df,ndf,checkSMILES=F,checkMz=F,checkNames=F) {
         ll<-length(unique(df$SMILES))
         if (ll<lsmiles) {
             warning("There are duplicate SMILES in the compound list. Trouble ahead.")
-            return(NULL)
         }
     }