diff --git a/.yarn/releases/yarn-1.15.2.js b/.yarn/releases/yarn-1.15.2.js
index 8a6eb5a18..5491be13f 100755
--- a/.yarn/releases/yarn-1.15.2.js
+++ b/.yarn/releases/yarn-1.15.2.js
@@ -155804,7 +155804,7 @@ empty list will be returned. A validation error will have two properties:
       }
 
       function ctorName(val) {
-        return val.constructor ? val.constructor.name : null
+        return val.constructor && typeof val.constructor === 'function' ? val.constructor.name : null
       }
 
       function isArray(val) {