该bug发生的时机与项目场景无关，以下是该bug出现的堆栈

@MiniProgramError

undefined is not an object (evaluating 't.fa')

TypeError: undefined is not an object (evaluating 't.fa')

at xt@weapp: (wxfs/game.js: 15:1213874)

at @weapp: (wxfs/game.js: 15:1218981) at @weapp: (wxfs/game.js: 15:1219517)

at @weapp: (wxfs/game.js: 15:628267) at @weapp: (wxfs/game.js: 15:628159) at @weapp: (wxfs/game.js: 15:628013) at @weapp: (wxfs/game.js: 15:627946) at @weapp: (wxfs/game.js:15:627799) at @weapp: (wxfs/game.js: 15:627597) at @weapp: (wxfs/game.js: 15:628671) at @weapp: (wxfs/game.js: 15:628289) at @weapp: (wxfs/game.js: 15:628159) at @weapp: (wxfs/game.js: 15:628013) at @weapp: (wxfs/game.js: 15:627946) at @weapp: (wxfs/game.js:15:627799) at @weapp: (wxfs/game.js: 15:627597) at @weapp: (wxfs/game.js: 15:628671) at @weapp: (wxfs/game.js:15:628159) at @weapp: (wxfs/game.js:15:628013) at @weapp: (wxfs/game.js: 15:627799) at @weapp: (wxfs/game.js: 15:627597) at @weapp: (wxfs/game.js: 15:628671)

at @weapp: (wxfs/game. js: 15:628159) at @weapp: (wxfs/game.js: 15:628013) at @weapp: (wxfs/game.js:15:627799) at @weapp: (wxfs/game.js: 15:627597) at @weapp: (wxfs/game.js: 15:628671) at @weapp: (wxfs/game.js: 15:628671) at @weapp: (wxfs/game.js: 15:628671) at @weapp: (wxfs/game.js:15:628671) at @weapp: (wxfs/game.js: 15:629919) at @weapp: (wxfs/game.js:15:629989)

at render@weapp: (wxfs/game.js:15:626818)

at mainLoop@weapp: (wxfs/game.js: 15:131204)

at t@weapp: (wxfs/game.js:3:15085)

at @weapp:(wxcommlib/WAGameSubContext.js:1:213953)