ArgumentOutOfRangeException when calling CrashReport.reports

Using C# to read the Unity CrashReport.reports array, it will throw the following exception/stack when running on an iOS device:

 ArgumentOutOfRangeException: Argument is out of range.
 System.DateTime.AddTicks (Int64 value)
 System.DateTime.AddMilliseconds (Double value)
 System.DateTime.AddSeconds (Double value)
 UnityEngine.CrashReport.PopulateReports ()
 UnityEngine.CrashReport.get_reports ()

I'm using a nearly identical call as documented here: http://docs.unity3d.com/Documentation/ScriptReference/CrashReport.html

This is the line of code failing:

 var reports = CrashReport.reports;

In the CrashReporter.h, I have the following:

 #define ENABLE_IOS_CRASH_REPORTING 1
 #define ENABLE_CUSTOM_CRASH_REPORTER 1
 #define ENABLE_CRASH_REPORT_SUBMISSION 0

In case it's relevant, my Player Settings have:

 Script Call Optimization is "Slow and Safe"

I'm using Unity 4.3.4f1 on a trial Pro License. I'm building to iOS with default settings and compiling with Xcode 5.1 (5B130a). My iOS device is an iPhone 5 (MD644LL/A) running iOS 7.1 (11D167).

Any assistance is appreciated! Thanks :D

Update #1:

As requested, here is my exact code where I call into CrashReport.reports.

To clarify, the exception is thrown when I call "CrashReport.reports"- not when I attempt to iterate on the return value. The ArgumentOutOfRangeException stack above indicates the crash is within the Unity framework, not my script.

 void OnGUI() {
     GUILayout.Label(labelText);
     GUILayout.Label("Crash reports:");

     // this call is crashing with ArgumentOutOfRangeException
     va reports = CrashReport.reports; 
 
     if (reports == null)
         return;
 
     foreach (var r in reports) {
 
         GUILayout.BeginHorizontal();
         GUILayout.Label("Crash: " + r.time);
         if (GUILayout.Button("Log")) {
             Debug.Log(r.text);
         }
         if (GUILayout.Button("Remove")) {
             r.Remove();
         }
         GUILayout.EndHorizontal();
 
         var report = CreateReport(r.text, r.text);
         SendReportToServer(report);
     }
 }

Also, perchik (thanks!) mentioned it could be license related. The docs say:

CrashReport API requires Unity Pro license for target platform.

This may very well be related, as I'm only using a trail version of Unity Pro without the iOS Pro Addon. I'll update as soon as I can verify this is the case or not. Either way, it's a strange way to abort the call if not licensed for it :)