fab 在微信小程序中报错

VM10398:1 thirdScriptError  
Cannot read property '_onClick' of undefined; [Component] Event Handler Error @ components/uni-fab/uni-fab#handleEvent  
TypeError: Cannot read property '_onClick' of undefined  
    at http://127.0.0.1:62819/appservice/common/vendor.js:1968:39  
    at Array.forEach (<anonymous>)  
    at http://127.0.0.1:62819/appservice/common/vendor.js:1965:23  
    at Array.forEach (<anonymous>)  
    at r.handleEvent [as __e] (http://127.0.0.1:62819/appservice/common/vendor.js:1955:17)  
    at Object.r.safeCallback (http://127.0.0.1:62819/appservice/__dev__/WAService.js:14:10521)  
    at http://127.0.0.1:62819/appservice/__dev__/WAService.js:16:19796  
    at d (http://127.0.0.1:62819/appservice/__dev__/WAService.js:16:22199)  
    at e (http://127.0.0.1:62819/appservice/appservice?t=1559715319785:1769:23113)  
    at r.registerCallback.t (http://127.0.0.1:62819/appservice/appservice?t=1559715319785:1769:23298)