diff --git a/js/tooltip.js b/js/tooltip.js
index 0758b07eef..e730db6e95 100644
--- a/js/tooltip.js
+++ b/js/tooltip.js
@@ -323,7 +323,7 @@
     var isBody = el.tagName == 'BODY'
     var isSvg  = window.SVGElement && el instanceof window.SVGElement
 
-    var elRect    = el.getBoundingClientRect ? el.getBoundingClientRect() : null
+    var elRect    = el.getBoundingClientRect()
     var elOffset  = isBody ? { top: 0, left: 0 } : $element.offset()
     var scroll    = { scroll: isBody ? document.documentElement.scrollTop || document.body.scrollTop : $element.scrollTop() }
     var outerDims = isSvg ? {} : {