Querying 1 item library

Hi,

I am querying library with 1 item and storing in to a 'IDCollection'. Then using for-each to run through the IDCollection (1 item and getting it's document ID)

On for-each loop, I am doing 'For each IDcollection', out put to 'IDVar'

When I reach the for-each loop, my workflow is crashing with the following error. (The workflow is going in to the for-each then outputting a blank line as the IDVar) I am assuming the 1-item is the culprit. How can I overcome this? Any help is appreciated!

I tried changing gathering Document ID in to IDs...did not help either

RequestorId: 3f28b335-838a-7221-0000-000000000000. Details: An unhandled exception occurred during the execution of the workflow instance. Exception details: System.ArgumentNullException: Value cannot be null. Parameter name: String at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at Microsoft.Activities.Expressions.ParseNumber`1.Execute(CodeActivityContext context) at System.Activities.CodeActivity`1.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation) Exception from activity ParseNumber<Int32> FormatString DynamicActivity<Guid> ChildActivityStep Sequence ForEachKeyValuePairStep ForEachSequence If DynamicValue Is Not Empty And Number of Items Greater Than 0 For Each ChildActivityStep Sequence ForEachKeyValuePairStep ForEachSequence If DynamicValue Is Not Empty And Number of Items Greater Than 0 For Each Branch Parallel Block Sequence