diff --git a/qt-ui/diveplanner.cpp b/qt-ui/diveplanner.cpp
index bb00299b8..2b1662f7d 100644
--- a/qt-ui/diveplanner.cpp
+++ b/qt-ui/diveplanner.cpp
@@ -852,6 +852,7 @@ void DivePlannerPointsModel::createTemporaryPlan()
 void DivePlannerPointsModel::deleteTemporaryPlan()
 {
 	deleteTemporaryPlan(diveplan.dp);
+	diveplan.dp = NULL;
 	delete_single_dive(get_divenr(tempDive));
 	tempDive = NULL;
 }