On first condition met it shouldn't check other conditions

First of all I apologies for my bad English.

We have following rule and in this when input1 is coming null we are getting following exception. But as we are checking input1 == null then it shouldn't check the conditions after that as it's returning true from there only.

Exception:
Exception while parsing expression input1 == null OR (input1 != null AND input1.legals != null AND input1.legals.Count() > 0) - No applicable method 'Count' exists in type 'Object'

Rule:
{
"RuleName": "LegalsNull",
"SuccessEvent": "Legals are OK.",
"ErrorMessage": "Legals should not be null.",
"ErrorType": "Error",
"RuleExpressionType": "LambdaExpression",
"Expression": "input1 == null OR (input1 != null AND input1.legals != null AND input1.legals.Count() > 0)"
}

I am already using
var reSettings = new ReSettings { NestedRuleExecutionMode = NestedRuleExecutionMode.Performance }; here.

Start by reproducing the reported expression with input1 set to null and NestedRuleExecutionMode.Performance enabled. Trace the expression evaluation path responsible for calling Count on Object; done means the OR expression does not evaluate later conditions after input1 == null is true and the reported exception is covered by a regression test.