diff --git a/ghost/admin/app/mixins/text-input.js b/ghost/admin/app/mixins/text-input.js
index fe2630d494..60fc96250b 100644
--- a/ghost/admin/app/mixins/text-input.js
+++ b/ghost/admin/app/mixins/text-input.js
@@ -61,10 +61,12 @@ export default Mixin.create({
     },
 
     keyUp(event) {
-        let methodName = this._getMethodFromKeyCode(event.keyCode);
-        let method = this.get(`keyEvents.${methodName}`);
-        if (method) {
-            method(event.target.value);
+        if (event.keyCode) {
+            let methodName = this._getMethodFromKeyCode(event.keyCode);
+            let method = this.get(`keyEvents.${methodName}`);
+            if (method) {
+                method(event.target.value);
+            }
         }
     },