diff --git a/src/util/anim_ease.js b/src/util/anim_ease.js
index b34d94b3cc0..32b79b2cb47 100644
--- a/src/util/anim_ease.js
+++ b/src/util/anim_ease.js
@@ -6,7 +6,13 @@
       s = p / 4;
     }
     else {
-      s = p / (2 * Math.PI) * Math.asin(c / a);
+      //handle the 0/0 case:
+      if (c === 0 && a === 0) {
+        s = p / (2 * Math.PI) * Math.asin(1);
+      }
+      else {
+        s = p / (2 * Math.PI) * Math.asin(c / a);
+      }
     }
     return { a: a, c: c, p: p, s: s };
   }