client: hoverable-tooltip: consider focus moving, not evaporating

1 files changed, 4 insertions, 1 deletions

diff --git a/src/static/js/client/hoverable-tooltip.js b/src/static/js/client/hoverable-tooltip.js
index cdf37ee1..2d1ac552 100644
--- a/src/static/js/client/hoverable-tooltip.js
+++ b/src/static/js/client/hoverable-tooltip.js
@@ -338,7 +338,10 @@ function handleTooltipHoverableLostFocus(hoverable, domEvent) {
   // This will set the tooltipWasJustHidden flag, which is detected by a newly
   // focused hoverable, if applicable. Always specify intent to replace when
   // navigating via tab focus. (Check `handleTooltipLostFocus` for details.)
-  if (!currentlyShownTooltipHasFocus(domEvent.relatedTarget)) {
+  if (
+    domEvent.relatedTarget &&
+    !currentlyShownTooltipHasFocus(domEvent.relatedTarget)
+  ) {
     hideCurrentlyShownTooltip(true);
   }
 }