From 1b6a7113d9cbcfcd7f5f8b21b0085f97c010a6f3 Mon Sep 17 00:00:00 2001
From: Renaud G <renaud@rolisteam.org>
Date: Fri, 28 Dec 2018 23:28:12 +0100
Subject: -add error when previous is null.

---
 node/mergenode.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'node/mergenode.cpp')

diff --git a/node/mergenode.cpp b/node/mergenode.cpp
index c79521b..f866db6 100644
--- a/node/mergenode.cpp
+++ b/node/mergenode.cpp
@@ -28,6 +28,12 @@ MergeNode::MergeNode()
 }
 void MergeNode::run(ExecutionNode* previous)
 {
+    if(nullptr == previous)
+    {
+        m_errors.insert(ExecutionNode::NO_PREVIOUS_ERROR, QObject::tr("No previous node before Merge operator"));
+        return;
+    }
+
     m_previousNode = previous;
     m_result->setPrevious(previous->getResult());
     ExecutionNode* previousLast =nullptr;
-- 
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