diff --git a/dabo/functions/calc_ema.sh b/dabo/functions/calc_ema.sh
index 8019674..9bfd931 100644
--- a/dabo/functions/calc_ema.sh
+++ b/dabo/functions/calc_ema.sh
@@ -40,9 +40,6 @@ function calc_ema {
   # check if there is a column (i from loop through array)
   [ -z "$f_column" ] && return 3
   
-  # check for enough positions/values to calculate (enough values)
-  [ $f_position -ge $f_period ] || return 0
-
   # get ema column
   [ -z "$f_target_column" ] && local f_target_column="ema$f_period"
 
@@ -58,6 +55,12 @@ function calc_ema {
   local f_last_ema_position=$((f_position-1))
   local f_last_ema=${v_csv_array_associative[${f_target_column}_${f_last_ema_position}]}
 
+  # check for enough positions/values to calculate (enough values) if SMA needed
+  if [ -z "$f_last_ema" ]
+  then
+    [ $f_position -ge $f_period ] || return 5
+  fi
+
   # check if last EMA is given
   if [ -n "$f_last_ema" ]
   then
@@ -94,7 +97,6 @@ function calc_ema {
   fi
   v_csv_array_associative[${f_target_column}_${f_position}]=$g_calc_result
   f_ema=$g_calc_result
-
   return 0
 }