[education/rkward] rkward/rbackend: Fix nullpointer dereference during exit.

[Thomas Friedrichsmeier]

Git commit c37e1897501f04749d4750fd0611d920694134a2 by Thomas Friedrichsmeier.
Committed on 20/10/2023 at 18:21.
Pushed by tfry into branch 'master'.

Fix nullpointer dereference during exit.

BUG: 475810

M  +1    -0    rkward/rbackend/rktransmitter.cpp

https://invent.kde.org/education/rkward/-/commit/c37e1897501f04749d4750fd0611d920694134a2

diff --git a/rkward/rbackend/rktransmitter.cpp b/rkward/rbackend/rktransmitter.cpp
index 09e3de4f3..a39aadc2f 100644
--- a/rkward/rbackend/rktransmitter.cpp
+++ b/rkward/rbackend/rktransmitter.cpp
@@ -269,6 +269,7 @@ void RKAbstractTransmitter::setConnection (QLocalSocket *_connection) {
 void RKAbstractTransmitter::disconnected () {
 	RK_TRACE (RBACKEND);
 
+	if (!connection) return;  // -> May happen in RKRBackendTransmitter::doExit()
 	handleTransmissionError ("Connection closed unexpectedly. Last error was: " + connection->errorString ());
 }