Error "Quest.Toad.SQLRecall.SQLRecallItemExtensions" when executing a SQL Script in Editor (4310536)

The following error occurs when executng a SQL script in the Editor window:

NullReferenceException message :

at Quest.Toad.SQLRecall.SQLRecallItemExtensions.<>c__DisplayClass2_0.b__0(FileStorageItem`1 i) at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate) at Quest.Toad.SQLRecall.SQLRecallItemExtensions.AddItem(JsonFileStorage`1 storage, SQLRecallItem item, String body) at Quest.Toad.SQLRecall.ProducerConsumerQueue`1.Work() at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()

1.  Close Toad
2.  Go to C:\Users\{username}\AppData\Roaming\Quest Software\Toad for {platform} X.x              (e.g. Toad for DB2 7.1)
3.  Rename folder SQLRecall to SQLRecall_old
4.  Launch Toad and retest