fix possible overflow in effect wrappers. am: 9e29523b95 am: baebc739b0 am: 3a9d4f4a83 am: 5b7c20dd1e am: df81fc3f3c
am: 68e43cf141

* commit '68e43cf141a5851c242bce776dff93f7136cbea6':
  fix possible overflow in effect wrappers.