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MiniProgramError
Cannot read properties of undefined (reading '_')
TypeError: Cannot read properties of undefined (reading '_')
at I (pages/pay/pay.appservice.js:1:259)
at U0 (pages/pay/pay.appservice.js:1:4558)
at t.handleChildrenCreation (common.app.js:1:30533)
at (common.app.js:1:30943)
at S0 (pages/pay/pay.appservice.js:1:4707)
at t.handleChildrenCreation (common.app.js:1:30533)
请具体描述问题出现的流程，并提供能复现问题的简单代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）。