also do this in try catch

src/matrix/storage/idb/Store.js

@@ -35,11 +35,11 @@ class QueryTargetWrapper {
     }
     
     openKeyCursor(...params) {
+        try {
             // not supported on Edge 15
             if (!this._qt.openKeyCursor) {
                 return this.openCursor(...params);
             }
-        try {
             return this._qt.openKeyCursor(...params);
         } catch(err) {
             throw new IDBRequestAttemptError("openKeyCursor", this._qt, err, params);