diff --git a/src/app/App.tsx b/src/app/App.tsx
index 00680e52..af1e021e 100644
--- a/src/app/App.tsx
+++ b/src/app/App.tsx
@@ -290,7 +290,7 @@ function isCommitIncrementKey(key: string): boolean {
 function blurActiveTextEntry() {
   const activeElement = document.activeElement;
 
-  if (!isTextEntryTarget(activeElement)) {
+  if (!(activeElement instanceof HTMLElement) || !isTextEntryTarget(activeElement)) {
     return;
   }