diff --git a/src/SIL.Machine/Corpora/ParallelTextCorpus.cs b/src/SIL.Machine/Corpora/ParallelTextCorpus.cs
index 039329d1..2f8a4884 100644
--- a/src/SIL.Machine/Corpora/ParallelTextCorpus.cs
+++ b/src/SIL.Machine/Corpora/ParallelTextCorpus.cs
@@ -535,6 +535,7 @@ private class TargetCorpusEnumerator : DisposableBase, IEnumerator<TextRow>
             private readonly ScrVers _sourceVersification;
             private TextRow _current;
             private bool _isEnumerating = false;
+            private bool _enumeratorHasMoreData = true;
 
             public TargetCorpusEnumerator(
                 IEnumerator<TextRow> enumerator,
@@ -564,7 +565,7 @@ public bool MoveNext()
                         _enumerator.MoveNext();
                         _isEnumerating = true;
                     }
-                    if (_verseRows.Count == 0 && _enumerator.Current != null)
+                    if (_verseRows.Count == 0 && _enumerator.Current != null && _enumeratorHasMoreData)
                         CollectVerses();
                     if (_verseRows.Count > 0)
                     {
@@ -575,15 +576,16 @@ public bool MoveNext()
                     return false;
                 }
 
-                bool result = _enumerator.MoveNext();
+                _enumeratorHasMoreData = _enumerator.MoveNext();
                 _current = _enumerator.Current;
-                return result;
+                return _enumeratorHasMoreData;
             }
 
             public void Reset()
             {
                 _enumerator.Reset();
                 _isEnumerating = false;
+                _enumeratorHasMoreData = true;
             }
 
             protected override void DisposeManagedResources()
@@ -635,7 +637,8 @@ private void CollectVerses()
                     if (!outOfOrder && scrRef.CompareTo(prevScrRef) < 0)
                         outOfOrder = true;
                     prevScrRef = scrRef;
-                } while (_enumerator.MoveNext());
+                    _enumeratorHasMoreData = _enumerator.MoveNext();
+                } while (_enumeratorHasMoreData);
 
                 if (outOfOrder)
                     rowList.Sort((x, y) => x.Ref.CompareTo(y.Ref));