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-rw-r--r--ext/mixed/js/display.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index 575011fd..228e554a 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -539,7 +539,7 @@ class Display {
static getKeyFromEvent(event) {
const key = event.key;
- return key.length === 1 ? key.toUpperCase() : key;
+ return (typeof key === 'string' ? (key.length === 1 ? key.toUpperCase() : key) : '');
}
}