Don't call QSet::erase() on an end iterator

hash.erase(hash.constFind()) is bound to crash if the hash doesn't
contain the item we're looking for.

Change-Id: Icbefca87b0258970373ec55d5dc113e6ab39c5f0
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/corelib/itemmodels/qabstractitemmodel.cpp b/src/corelib/itemmodels/qabstractitemmodel.cpp
index addeeafd45..41bdaa2ac5 100644
--- a/src/corelib/itemmodels/qabstractitemmodel.cpp
+++ b/src/corelib/itemmodels/qabstractitemmodel.cpp
@@ -951,7 +951,9 @@ void QAbstractItemModelPrivate::columnsRemoved(const QModelIndex &parent,
     for (QVector<QPersistentModelIndexData *>::const_iterator it = persistent_invalidated.constBegin();
          it != persistent_invalidated.constEnd(); ++it) {
         QPersistentModelIndexData *data = *it;
-        persistent.indexes.erase(persistent.indexes.constFind(data->index));
+        auto index = persistent.indexes.constFind(data->index);
+        if (index != persistent.indexes.constEnd())
+            persistent.indexes.erase(index);
         data->index = QModelIndex();
     }
 }