拉斐尔与MDL发生冲突

Question

Raphael JS似乎与我的Material Design Lite发生冲突。当我使用Raphael时，我看到此MDL错误：

Uncaught Error: Invalid argument provided to upgrade MDL element.
at a (material.min.js:8)
at n (material.min.js:8)
at Object._ [as upgradeAllRegistered] (material.min.js:8)
at material.min.js:8

并且无法升级MDL元素。