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Reprodution:

1. Create basic flex project
2. Add 2 textInputs
3. Add 2 StringValidators (valid1, valid2) each one pointing to a textInput
4/ add 1 button with a click='clickHandler()'
5. in code:

import mx.validators.Validator;
private var myValidator:Array
add function to run on initialize of application:
private function initApp():void{
  myValidators=[valid1, valid2];}
also add:
private function clickHandler():void{
Validator.ValidateAll(myValidators);
}

6. run this, should work fine. now add enabled='false' attribute to one of the stringvalidators. Run again. You get this error:

Actual Results:

RTE: Cannot access a property or method of a null object reference.

Expected results: no RTE

Workaround:
this is a pretty easy fix to the static method ValidateAll():

public static function validateAllEnabled(validators:Array):Array
    {
        var result:Array = [];

var n:int = validators.length;
        for (var i:int = 0; i < n; i++)
        {
            var v:Validator = Validator(validators);
           
if(v.enabled){//added this if clause
            var resultEvent:ValidationResultEvent = v.validate();
           
if (resultEvent.type != ValidationResultEvent.VALID)
                result.push(resultEvent);
        }
        }
       
return result;
}
        

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Reprodution: 1. Create basic flex project 2. Add 2 textInputs 3. Add 2 StringValidators (valid1, valid2) each one pointing to a textInput 4/ add 1 button with a click='clickHandler()' 5. in code: import mx.validators.Validator; private var myValidator:Array add function to run on initialize of application: private function initApp():void{   myValidators=[valid1, valid2];} also add: private function clickHandler():void{ Validator.ValidateAll(myValidators); } 6. run this, should work fine. now add enabled='false' attribute to one of the stringvalidators. Run again. You get this error: Actual Results: RTE: Cannot access a property or method of a null object reference. Expected results: no RTE Workaround: this is a pretty easy fix to the static method ValidateAll(): public static function validateAllEnabled(validators:Array):Array     {         var result:Array = []; var n:int = validators.length;         for (var i:int = 0; i < n; i++)         {             var v:Validator = Validator(validators);             if(v.enabled){//added this if clause             var resultEvent:ValidationResultEvent = v.validate();             if (resultEvent.type != ValidationResultEvent.VALID)                 result.push(resultEvent);         }         }         return result; }