diff --git a/R/liger.R b/R/liger.R
index d67fec2f..f73c3118 100644
--- a/R/liger.R
+++ b/R/liger.R
@@ -1615,6 +1615,9 @@ quantileAlignSNF.list <- function(
     set.seed(seed = NULL)
     id.number <- sample(x = 1000000:9999999, size = 1)
   }
+  is.defined <- function(sym) class(try(sym, TRUE))!='try-error'
+  if(!is.defined(resolution)){stop("'resolution' is not properly defined")}
+  if(!is.finite(resolution)){stop("'resolution' is not properly defined")}
   idents <- snf$idents
   Hs <- object
   idents.rest <- SLMCluster(
@@ -4467,4 +4470,4 @@ convertOldLiger = function(object, override.raw = F) {
   # class has slots that this particular object does not
   print(paste0('New slots not filled: ', setdiff(slots_new[slots_new != "cell.data"], slots)))
   return(new.liger)
-}
\ No newline at end of file
+}