diff --git a/gnuplot-qlist-message.patch b/gnuplot-qlist-message.patch
new file mode 100644
index 0000000..2242ca4
--- /dev/null
+++ b/gnuplot-qlist-message.patch
@@ -0,0 +1,27 @@
+--- a/src/qtterminal/QtGnuplotScene.cpp
++++ b/src/qtterminal/QtGnuplotScene.cpp
+@@ -167,9 +167,7 @@
+ void QtGnuplotScene::update_key_box(const QRectF rect)
+ {
+ 	if (m_currentPlotNumber > m_key_boxes.count()) {
+-		// DEBUG Feb 2018 should no longer trigger
+-		// because m_key_box insertion is done in layer code for GEAfterPlot
+-		m_key_boxes.insert(m_currentPlotNumber, QtGnuplotKeybox(rect));
++		m_key_boxes.insert(m_currentPlotNumber-1, QtGnuplotKeybox(rect));
+ 	} else if (m_key_boxes[m_currentPlotNumber-1].isEmpty()) {
+ 		// Retain the visible/hidden flag when re-initializing the Keybox
+ 		bool tmp = m_key_boxes[m_currentPlotNumber-1].ishidden();
+@@ -515,12 +513,12 @@
+ 			if (0 < m_currentPlotNumber && m_currentPlotNumber <= m_key_boxes.count())
+ 				newgroup->setVisible( !(m_key_boxes[m_currentPlotNumber-1].ishidden()) );
+ 			// Store it in an ordered list so we can toggle it by index
+-			m_plot_group.insert(m_currentPlotNumber, newgroup);
++			m_plot_group.insert(m_currentPlotNumber-1, newgroup);
+ 		} 
+ 
+ 		if (m_currentPlotNumber >= m_key_boxes.count()) {
+ 			QRectF empty( QPointF(0,0), QPointF(0,0));
+-			m_key_boxes.insert(m_currentPlotNumber,  empty);
++			m_key_boxes.append(empty);
+ 			m_key_boxes[m_currentPlotNumber-1].resetStatus();
+ 		}
diff --git a/gnuplot.spec b/gnuplot.spec
index 7411567..f33afd5 100644
--- a/gnuplot.spec
+++ b/gnuplot.spec
@@ -13,7 +13,7 @@
 Summary: A program for plotting mathematical expressions and data
 Name: gnuplot
 Version: %{major}.%{minor}.%{patchlevel}
-Release: 3%{?dist}
+Release: 4%{?dist}
 # MIT .. term/PostScript/aglfn.txt
 License: gnuplot and MIT
 Group: Applications/Engineering
@@ -34,6 +34,9 @@ Patch5: gnuplot-5.0.0-lua_checkint.patch
 Patch6: gnuplot-5.2.4-no-lena.patch
 Patch7: gnuplot-5.2.2-doc.patch
 patch8: gnuplot-5.2.4-cmd-opts.patch
+# Suppress error messages "QList index out of range"
+# Patch from upstream https://sourceforge.net/p/gnuplot/support-requests/269/
+Patch20: gnuplot-qlist-message.patch
 
 Requires: %{name}-common = %{version}-%{release}
 Requires: dejavu-sans-fonts
@@ -173,6 +176,7 @@ plotting tool.
 %patch6 -p1 -b .nolena
 %patch7 -p1 -b .doc
 %patch8 -p1 -b .cmd-opts
+%patch20 -p1 -b .qlist-index
 sed -i -e 's:"/usr/lib/X11/app-defaults":"%{x11_app_defaults_dir}":' src/gplt_x11.c
 iconv -f windows-1252 -t utf-8 ChangeLog > ChangeLog.aux
 mv ChangeLog.aux ChangeLog
@@ -378,6 +382,9 @@ fi
 %{_datadir}/texlive/texmf-dist/tex/latex/gnuplot/
 
 %changelog
+* Wed May 27 2026 Pavel Cahyna <pcahyna@redhat.com> - 5.2.4-4
+- Fix Qlist error message (Fedora bug #1970658)
+
 * Wed Oct  5 2022 Pavel Cahyna <pcahyna@redhat.com> - 5.2.4-3
 - Rebuild with added gating configuration