diff --git a/index.html b/index.html
index 77c1dc52..aebfa891 100644
--- a/index.html
+++ b/index.html
@@ -7923,7 +7923,7 @@
     <script defer src="modules/io/save.js"></script>
     <script defer src="modules/io/load.js?v=1.88.05"></script>
     <script defer src="modules/io/cloud.js"></script>
-    <script defer src="modules/io/export.js?v=1.89.16"></script>
+    <script defer src="modules/io/export.js?v=1.89.17"></script>
     <script defer src="modules/io/formats.js"></script>
 
     <!-- Web Components -->
diff --git a/modules/io/export.js b/modules/io/export.js
index 7cd5eccf..8484744b 100644
--- a/modules/io/export.js
+++ b/modules/io/export.js
@@ -240,12 +240,14 @@ async function getMapURL(type, options = {}) {
   if (location.hostname && cloneEl.getElementById("oceanicPattern")) {
     const el = cloneEl.getElementById("oceanicPattern");
     const url = el.getAttribute("href");
-    await new Promise(resolve => {
-      getBase64(url, base64 => {
-        el.setAttribute("href", base64);
-        resolve();
+    if (url) {
+      await new Promise(resolve => {
+        getBase64(url, base64 => {
+          el.setAttribute("href", base64);
+          resolve();
+        });
       });
-    });
+    }
   }
 
   // add relief icons
diff --git a/versioning.js b/versioning.js
index d89e3f94..0b40a83e 100644
--- a/versioning.js
+++ b/versioning.js
@@ -1,7 +1,7 @@
 "use strict";
 
 // version and caching control
-const version = "1.89.16"; // generator version, update each time
+const version = "1.89.17"; // generator version, update each time
 
 {
   document.title += " v" + version;