diff --git a/index.html b/index.html
index 44406fde..f143a48a 100644
--- a/index.html
+++ b/index.html
@@ -8004,8 +8004,8 @@
     <script defer src="libs/rgbquant.min.js"></script>
     <script defer src="libs/jquery.ui.touch-punch.min.js"></script>
 
-    <script defer src="modules/io/save.js?v=1.90.00"></script>
-    <script defer src="modules/io/load.js?v=1.91.03"></script>
+    <script defer src="modules/io/save.js?v=1.91.04"></script>
+    <script defer src="modules/io/load.js?v=1.91.04"></script>
     <script defer src="modules/io/cloud.js"></script>
     <script defer src="modules/io/export.js?v=1.89.36"></script>
     <script defer src="modules/io/formats.js"></script>
diff --git a/modules/io/load.js b/modules/io/load.js
index 969cd80b..7b74da08 100644
--- a/modules/io/load.js
+++ b/modules/io/load.js
@@ -221,9 +221,9 @@ async function parseLoadedData(data) {
       if (settings[18]) precInput.value = precOutput.value = settings[18];
 
       if (settings[19]) options = JSON.parse(settings[19]);
-      // setting 16 and 17 (temperature) are part of options now
-      if (settings[16]) options.temperatureEquator = Number(settings[16]);
-      if (settings[17]) options.temperatureNorthPole = options.temperatureSouthPole = Number(settings[17]);
+      // setting 16 and 17 (temperature) are part of options now, kept as "" in newer versions for compatibility
+      if (settings[16]) options.temperatureEquator = +settings[16];
+      if (settings[17]) options.temperatureNorthPole = options.temperatureSouthPole = +settings[17];
 
       if (settings[20]) mapName.value = settings[20];
       if (settings[21]) hideLabels.checked = +settings[21];
diff --git a/modules/io/save.js b/modules/io/save.js
index f3e58147..97cf7c09 100644
--- a/modules/io/save.js
+++ b/modules/io/save.js
@@ -24,8 +24,8 @@ function getMapData() {
     urbanization,
     mapSizeOutput.value,
     latitudeOutput.value,
-    0, // previously used for temperatureEquatorOutput.value
-    0, // previously used for tempNorthOutput.value
+    "", // previously used for temperatureEquatorOutput.value
+    "", // previously used for tempNorthOutput.value
     precOutput.value,
     JSON.stringify(options),
     mapName.value,
diff --git a/versioning.js b/versioning.js
index cb55079b..d6b17ab3 100644
--- a/versioning.js
+++ b/versioning.js
@@ -1,7 +1,7 @@
 "use strict";
 
 // version and caching control
-const version = "1.91.03"; // generator version, update each time
+const version = "1.91.04"; // generator version, update each time
 
 {
   document.title += " v" + version;