diff -r 019736440468 -r 63f9e4a23bfc www/js/global.js
--- a/www/js/global.js	Mon Mar 11 16:22:01 2019 +0100
+++ b/www/js/global.js	Mon Mar 11 16:26:00 2019 +0100
@@ -738,7 +738,7 @@
  */
 function abvol(og, fg) {
 
-	if ((og - fg) < 0)
+	if (((og - fg) < 0) || (fg < 0.9))
 		return 0;
 
 	/*