1 files changed, 3 insertions, 0 deletions
diff --git a/src/embind/embind.js b/src/embind/embind.js
index 6f905d55..355f05f4 100644
--- a/src/embind/embind.js
+++ b/src/embind/embind.js
@@ -157,6 +157,9 @@ function _embind_repr(v) {
 var registeredInstances = {};
 
 function getBasestPointer(class_, ptr) {
+    if (ptr === undefined) {
+        throwBindingError('ptr should not be undefined');
+    }
     while (class_.baseClass) {
         ptr = class_.upcast(ptr);
         class_ = class_.baseClass;