type 'Null' is not a subtype of type 'String' of 'function result' when update the provider model - flutter

Question

Provider version and dart
provider: ^6.0.1
sdk: ">=2.12.0 <3.0.0"
I have two screens.
Screen A - I have a form. when you tap on the textbox it will open a Screen B Full screen Modal.
Screen B - you will choose an item from the list in and return back to Screen A.
In the Screen A textbox i have wrapped with consumer method.
Consumer<AgentModel>( // <--- Consumer
builder: (context, agentModel, child) {
agentController.text = agentModel.name.toString();
return AppInputWrapper(
marginBottom: 'small',
widgets: Column(
children: [
TextFormField(
style: appInputStyle,
keyboardType: TextInputType.text,
autocorrect: false,
enableSuggestions: false,
decoration: AppInputStyleDecoration.textFieldStyle(hintTextStr: "Agent"),
controller: agentController,
validator: (value) {
return validateAgent(value);
},
readOnly: true,
onTap: (){
Navigator.push( context, MaterialPageRoute( builder: (context) => AgentFormComponent(),),);
},
),
],
),
);
}
)
When the first instance it comes from screen B to screen A its not loading the value from provider. i get the following error.
======== Exception caught by widgets library =======================================================
The following _TypeError was thrown building Consumer<AgentModel>(dirty, dependencies: [_InheritedProviderScope<AgentModel?>]):
type 'Null' is not a subtype of type 'String' of 'function result'
The relevant error-causing widget was:
Consumer<AgentModel> file:///Users/soundharraj/StudioProjects/LHMarine/lib/screens/jobs/create/form.dart:389:13
When the exception was thrown, this was the stack:
#0 _Location.file (package:flutter/src/widgets/widget_inspector.dart)
#1 _Location.toJsonMap (package:flutter/src/widgets/widget_inspector.dart:2844:15)
#2 _Location.toJsonMap.<anonymous closure> (package:flutter/src/widgets/widget_inspector.dart:2853:42)
#3 MappedListIterable.elementAt (dart:_internal/iterable.dart:412:31)
#4 ListIterator.moveNext (dart:_internal/iterable.dart:341:26)
...
====================================================================================================
Reloaded 1 of 1128 libraries in 592ms.
I am not sure how to check the provider value is NULL. its turn the string.
Thanks

Answer 1

Wrap your TextFormField with Gesturedetector on write your function on the ontab.