diff -r 9d1af81b20ef -r 9ac2fb6b1311 www/js/prod_edit.js
--- a/www/js/prod_edit.js	Wed Mar 18 19:46:15 2020 +0100
+++ b/www/js/prod_edit.js	Wed Mar 18 20:29:23 2020 +0100
@@ -64,6 +64,7 @@
  ok_yeasts = 1,       // Yeasts are in stock
  ok_waters = 1,       // Waters are in stock
 
+ data_loaded = 0;
  error_count = 0;
 
  hop_flavour = 0,
@@ -567,6 +568,7 @@
    calcStage();
    $('#jqxTabs').jqxTabs('select', 2);
    console.log('main data ready');
+   data_loaded = 1;
   },
   loadError: function(jqXHR, status, error) {
    console.log('main data load error: ' + status + ' ' + error);
@@ -2781,6 +2783,7 @@
  }
 
  function MashpH() {
+
   console.log('MashpH()');
   var n = 0, pH = 5.4, deltapH = 0.001, deltapd = 0.1, pd = ProtonDeficit(pH);
   while (((pd < -deltapd) || (pd > deltapd)) && (n < 2000)) {
@@ -2811,7 +2814,12 @@
 
  function calcWater() {
 
-  //console.log('calcWater()');
+  console.log('calcWater()');
+  if (! data_loaded) {
+   console.log('failsave');
+   return;
+  }
+
   var liters = 0,
   calcium = 0,
   magnesium = 0,
@@ -2870,9 +2878,10 @@
   $('#wg_sulfate').val(Math.round(sulfate * 10) / 10);
   // Note: brouwhulp has the malts included here in the result.
   //var wg_ph = ph;
+  var mash_ph = Round(MashpH(), 1);
   $('#wg_ph').val(Round(ph, 1));
-  $('#wb_ph').val(Round(MashpH(), 1));
-  $('#est_mash_ph').val(Round(MashpH(), 1));
+  $('#wb_ph').val(mash_ph);
+  $('#est_mash_ph').val(mash_ph);
   bicarbonate = total_alkalinity * 1.22;
   wg_bicarbonate = bicarbonate;