From a1064345d3c03ed8755cc84a60663dbdc4e68478 Mon Sep 17 00:00:00 2001
From: Kenneth Lyons <ixjlyons@gmail.com>
Date: Sat, 6 Feb 2021 15:31:54 -0800
Subject: [PATCH] Disable paint in GLScatterPlotItem if it has no data

---
 pyqtgraph/opengl/items/GLScatterPlotItem.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pyqtgraph/opengl/items/GLScatterPlotItem.py b/pyqtgraph/opengl/items/GLScatterPlotItem.py
index 463ad742..5d81515b 100644
--- a/pyqtgraph/opengl/items/GLScatterPlotItem.py
+++ b/pyqtgraph/opengl/items/GLScatterPlotItem.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 from OpenGL.GL import *
 from OpenGL.arrays import vbo
 from .. GLGraphicsItem import GLGraphicsItem
@@ -14,7 +15,7 @@ class GLScatterPlotItem(GLGraphicsItem):
         GLGraphicsItem.__init__(self)
         glopts = kwds.pop('glOptions', 'additive')
         self.setGLOptions(glopts)
-        self.pos = []
+        self.pos = None
         self.size = 10
         self.color = [1.0,1.0,1.0,0.5]
         self.pxMode = True
@@ -99,6 +100,9 @@ class GLScatterPlotItem(GLGraphicsItem):
         ##glPointParameterfv(GL_POINT_SIZE_MIN, (0,))
         
     def paint(self):
+        if self.pos is None:
+            return
+
         self.setupGLState()
         
         glEnable(GL_POINT_SPRITE)