Cannot read property 'introduce' of null

TypeError: Cannot read property 'introduce' of null
    at UserCenterHeader (/data/node_site/www.huoxing24.com.temp/node/server/build/webpack:/assets/containers/UserCenter/UserCenterHeader/index.js:31:71)
    at d (/data/node_site/www.huoxing24.com.temp/node/node_modules/_react-dom@16.14.0@react-dom/cjs/react-dom-server.node.production.min.js:36:498)
    at $a (/data/node_site/www.huoxing24.com.temp/node/node_modules/_react-dom@16.14.0@react-dom/cjs/react-dom-server.node.production.min.js:39:16)
    at a.b.render (/data/node_site/www.huoxing24.com.temp/node/node_modules/_react-dom@16.14.0@react-dom/cjs/react-dom-server.node.production.min.js:44:476)
    at a.b.read (/data/node_site/www.huoxing24.com.temp/node/node_modules/_react-dom@16.14.0@react-dom/cjs/react-dom-server.node.production.min.js:44:18)
    at renderToString (/data/node_site/www.huoxing24.com.temp/node/node_modules/_react-dom@16.14.0@react-dom/cjs/react-dom-server.node.production.min.js:54:364)
    at _callee$ (/data/node_site/www.huoxing24.com.temp/node/server/build/webpack:/server/render/render.js:209:34)
    at tryCatch (/data/node_site/www.huoxing24.com.temp/node/node_modules/_regenerator-runtime@0.13.7@regenerator-runtime/runtime.js:63:40)
    at Generator.invoke [as _invoke] (/data/node_site/www.huoxing24.com.temp/node/node_modules/_regenerator-runtime@0.13.7@regenerator-runtime/runtime.js:293:22)
    at Generator.next (/data/node_site/www.huoxing24.com.temp/node/node_modules/_regenerator-runtime@0.13.7@regenerator-runtime/runtime.js:118:21)