diff --git a/themes/grav/app/updates/safe-upgrade.js b/themes/grav/app/updates/safe-upgrade.js
index 6f8e9d0f..b023a7a4 100644
--- a/themes/grav/app/updates/safe-upgrade.js
+++ b/themes/grav/app/updates/safe-upgrade.js
@@ -487,7 +487,15 @@ export default class SafeUpgrade {
         this.stopPolling();
         this.jobId = null;
 
-        const body = { decisions: this.decisions };
+        const decisionFields = {};
+        Object.keys(this.decisions || {}).forEach((key) => {
+            const value = this.decisions[key];
+            if (value) {
+                decisionFields[`decisions[${key}]`] = value;
+            }
+        });
+
+        const body = decisionFields;
 
         request(this.urls.start, { method: 'post', body }, (response) => {
             if (!this.active) {
diff --git a/themes/grav/js/admin.min.js b/themes/grav/js/admin.min.js
index 63dd673b..b56409a1 100644
--- a/themes/grav/js/admin.min.js
+++ b/themes/grav/js/admin.min.js
@@ -4905,9 +4905,14 @@ var SafeUpgrade = /*#__PURE__*/function () {
       this.buttons.start.prop('disabled', true);
       this.stopPolling();
       this.jobId = null;
-      var body = {
-        decisions: this.decisions
-      };
+      var decisionFields = {};
+      Object.keys(this.decisions || {}).forEach(function (key) {
+        var value = _this4.decisions[key];
+        if (value) {
+          decisionFields["decisions[".concat(key, "]")] = value;
+        }
+      });
+      var body = decisionFields;
       utils_request(this.urls.start, {
         method: 'post',
         body: body