Invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific

I make a toggle to control a textfield in a form. When I run it, I get a piece of warning:

invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific - break on _CFRunLoopError_RunCalledWithInvalidMode to debug. This message will only appear once per execution

What could I do to fix it? What's the harm if it's not fixed( App crashes, or...?). Any help will be appreciated.

struct ContentView: View {

    @State private var toggle1 = true

    @State private var str1 = "..."

    var body: some View {

        Form{

            Section{

                Toggle(isOn: $toggle1, label: {

                    Text("Toggle 1")})

            }

            Section{

                    if toggle1{

                        HStack{

                            Text("Toggle 1")

                            TextField("...", text: $str1)

                        }

                    }

            }

            .textFieldStyle(RoundedBorderTextFieldStyle())

        }

    }

}
Invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific
 
 
Q