Index: sources/canbus/messageacknowmodel.cpp
===================================================================
diff -u -r93d7ff58cd6fd2fea5d00587ee712a637fc941bf -r56e378f7504701b9e9a9dccaf205aef2fd52c58e
--- sources/canbus/messageacknowmodel.cpp	(.../messageacknowmodel.cpp)	(revision 93d7ff58cd6fd2fea5d00587ee712a637fc941bf)
+++ sources/canbus/messageacknowmodel.cpp	(.../messageacknowmodel.cpp)	(revision 56e378f7504701b9e9a9dccaf205aef2fd52c58e)
@@ -1,14 +1,15 @@
 /*!
  *
  * Copyright (c) 2019-2020 Diality Inc. - All Rights Reserved.
- * copyright
- *          THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM,
- *          IN PART OR IN WHOLE,
- *          WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
+ * \copyright
+ * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
+ * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
  *
- * file    messageacknowmodel.cpp
- * date    1/17/2020
- * author  Behrouz NematiPour
+ * \file messageacknowmodel.cpp
+ * \author (last) Behrouz NematiPour
+ * \date (last) 30-Jul-2020
+ * \author (original) Behrouz NematiPour
+ * \date (original) 17-Jan-2020
  *
  */
 #include "messageacknowmodel.h"
@@ -161,8 +162,10 @@
  */
 void MessageAcknowModel::onAcknowReceive(Sequence vSequence)
 {
-    _acknowList[vSequence]->deleteLater();
-    _acknowList.remove(vSequence);
+    if (_acknowList.contains(vSequence)) {
+        _acknowList[vSequence]->deleteLater();
+        _acknowList.remove(vSequence);
+    }
 }
 
 /*!
@@ -189,5 +192,5 @@
     _acknowList[vSequence]->deleteLater();
     _acknowList.remove(vSequence);
     emit didFailedTransmit(vSequence);
-    LOG_ERROR( tr("Acknow retry failed for sequence %1").arg(vSequence) );
+    LOG_DEBUG( QString("Acknow retry failed for sequence %1").arg(vSequence) );
 }