diff --git a/src/ChartInternal/interactions/zoom.ts b/src/ChartInternal/interactions/zoom.ts
index 722084974..c2558f315 100644
--- a/src/ChartInternal/interactions/zoom.ts
+++ b/src/ChartInternal/interactions/zoom.ts
@@ -338,7 +338,7 @@ export default {
 		// https://bugs.webkit.org/show_bug.cgi?id=226683#c3
 		// https://stackoverflow.com/questions/67836886/wheel-event-is-not-fired-on-a-svg-group-element-in-safari
 		if (
-			window.GestureEvent && /^((?!chrome|android|mobile).)*safari/i.test(navigator.userAgent)
+			window.GestureEvent && /^((?!chrome|android|mobile).)*safari/i.test(window.navigator?.userAgent)
 		) {
 			svg.on("wheel", () => {});
 		}