From 4c41e3604424f508556d96b4a32081cca0b5f8bb Mon Sep 17 00:00:00 2001
From: Robin Mueller <robin.mueller.m@gmail.com>
Date: Tue, 22 Dec 2020 13:29:06 +0100
Subject: [PATCH] nullptr check added

---
 datapool/PoolDataSetBase.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/datapool/PoolDataSetBase.cpp b/datapool/PoolDataSetBase.cpp
index 1acd3fd3..cb2348f7 100644
--- a/datapool/PoolDataSetBase.cpp
+++ b/datapool/PoolDataSetBase.cpp
@@ -59,6 +59,11 @@ uint16_t PoolDataSetBase::getFillCount() const {
 
 ReturnValue_t PoolDataSetBase::readVariable(uint16_t count) {
 	ReturnValue_t result = HasReturnvaluesIF::RETURN_OK;
+	if(registeredVariables[count] == nullptr) {
+	    // configuration error.
+	    return HasReturnvaluesIF::RETURN_FAILED;
+	}
+
 	// These checks are often performed by the respective
 	// variable implementation too, but I guess a double check does not hurt.
 	if (registeredVariables[count]->getReadWriteMode() !=