Blazor登录触发空值错误求助：Value cannot be null (Parameter 'value')

我是Blazor开发新手，目前遇到的问题是：用户登录后虽能导航至主页，但主页内代码无法执行，抛出错误：One or more errors occurred. (Value cannot be null. (Parameter 'value'))。

调试时，代码在ApplicationDbContext类后停止，执行options.UseSqlServer(connectionString)时触发该错误。相关配置代码如下：

var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
options.UseSqlServer(connectionString));
builder.Services.AddDatabaseDeveloperPageExceptionFilter();

错误堆栈信息：

One or more errors occurred. (Value cannot be null. (Parameter 'value'))
at Jn (c:\Users\myuser\Documents\Visual Studio 2022\Projects\HmongCenterGB\HmongCenterGB\HmongCenterGB\wwwroot_framework\https:\raw.githubusercontent.com\dotnet\runtime\5535e31a712343a63f5d7d796cd874e563e5ac14\src\mono\wasm\runtime\marshal-to-js.ts:349:18)
at Ul (c:\Users\myuser\Documents\Visual Studio 2022\Projects\HmongCenterGB\HmongCenterGB\HmongCenterGB\wwwroot_framework\https:\raw.githubusercontent.com\dotnet\runtime\5535e31a712343a63f5d7d796cd874e563e5ac14\src\mono\wasm\runtime\marshal-to-js.ts:306:28)
at wasm://wasm/00b1e8b6:wasm-function[350]:0x1faca
at wasm://wasm/00b1e8b6:wasm-function[246]:0x1bf8b
at wasm://wasm/00b1e8b6:wasm-function[239]:0xf172
at wasm://wasm/00b1e8b6:wasm-function[307]:0x1e7e4
at wasm://wasm/00b1e8b6:wasm-function[328]:0x1efda
at wasm://wasm/00b1e8b6:wasm-function[218]:0xcfec
at wasm://wasm/00b1e8b6:wasm-function[774]:0x440ad
at e. (https://localhost:7030/_framework/dotnet.runtime.8.0.0.nk3t6c0vmt.js:3:214976)
{superStack: {…}, stack: , message: 'One or more errors occurred. (Value cannot be null. (Parameter 'value'))', Symbol(wasm js_owned_gc_handle): 86}

调试过程中未获取到足够的有效信息，希望能解决这个问题，让登录后主页代码可以正常执行。

内容的提问来源于stack exchange，提问作者Tou Thao