Unhandled Exception: type 'Null' is not a subtype of type 'String'

[zixinote]

修改API基础接口地址登录报500错误，但终端显示的200，然后退出软件在允许就是下面的错误了

hahahah@MacBook-Pro sail-master % flutter run
Launching lib/main.dart on iPhone 14 Pro in debug mode...
Running Xcode build...
└─Compiling, linking and signing... 5.6s
Xcode build done. 14.6s
[VERBOSE-2:dart_vm_initializer.cc(41)] Unhandled Exception: type 'Null' is not a subtype of type 'String'
#0 new UserEntity.fromMap (package:sail/entity/user_entity.dart:50:16)
#1 UserModel.refreshData (package:sail/models/user_model.dart:40:32)

#2 main (package:sail/main.dart:26:3)

Syncing files to device iPhone 14 Pro... 163ms

Flutter run key commands.
r Hot reload. 🔥🔥🔥
R Hot restart.
h List all available interactive commands.
d Detach (terminate "flutter run" but leave application running).
c Clear the screen
q Quit (terminate the application on the device).

💪 Running with sound null safety 💪

An Observatory debugger and profiler on iPhone 14 Pro is available at:
http://127.0.0.1:59531/zhxKH2HQKi8=/
The Flutter DevTools debugger and profiler on iPhone 14 Pro is available at:
http://127.0.0.1:9104?uri=http://127.0.0.1:59531/zhxKH2HQKi8=/