diff --git a/fio_splitter.sh b/fio_splitter.sh
index 5aeb576..c2361df 100644
--- a/fio_splitter.sh
+++ b/fio_splitter.sh
@@ -182,13 +182,25 @@ split_year() {
 	    DATEEND=`end_of_month $YEAR $MONTH`
 	    echo "dateEnd;$DATEEND"
 	    if [ -z $idFrom ] ; then
-		false
+		# Empty year
+		echo
+		grep "^ID" "$CSVNAME"
 	    else
-		echo "$idFrom"
-		echo "$idTo"
+		# Non-empty year, maybe non-empty month
+		numrec=`grep -c "^[0-9]*;...$MONTH.$YEAR;" "$CSVNAME"`
+		if [ $numrec = 0 ] ; then
+		    # Empty month
+		    echo
+		    grep "^ID" "$CSVNAME"
+		else
+		    # Non-empty month
+		    echo "$idFrom"
+		    echo "$idTo"
+		    echo
+		    grep "^ID" "$CSVNAME"
+		    grep "^[0-9]*;...$MONTH.$YEAR;" "$CSVNAME"
+		fi
 	    fi
-	    echo
-	    grep "^ID" "$CSVNAME"
 	} >"$MCSVNAME"
     done
 }