From ebd5a81a751eb7dd02204f7556b66c79930e1426 Mon Sep 17 00:00:00 2001
From: CodeCox <codecox@users.noreply.github.com>
Date: Thu, 22 Nov 2018 16:39:44 +0000
Subject: [PATCH] fixes NPE Issue #1

---
 orx-no-clear/src/main/kotlin/NoClear.kt | 28 +++++++++++++------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/orx-no-clear/src/main/kotlin/NoClear.kt b/orx-no-clear/src/main/kotlin/NoClear.kt
index 10624c637..1663a3d95 100644
--- a/orx-no-clear/src/main/kotlin/NoClear.kt
+++ b/orx-no-clear/src/main/kotlin/NoClear.kt
@@ -15,20 +15,22 @@ class NoClear : Extension {
 
 
     override fun beforeDraw(drawer: Drawer, program: Program) {
-        if (renderTarget == null || renderTarget?.width != program.width || renderTarget?.height != program.height) {
-            renderTarget?.let {
-                it.colorBuffer(0).destroy()
-                it.detachColorBuffers()
-                it.destroy()
-            }
-            renderTarget = renderTarget(program.width, program.height) {
-                colorBuffer()
-                depthBuffer()
-            }
+        if (program.width > 0 && program.height > 0) {    // only if the window is not minimised
+            if (renderTarget == null || renderTarget?.width != program.width || renderTarget?.height != program.height) {
+                renderTarget?.let {
+                    it.colorBuffer(0).destroy()
+                    it.detachColorBuffers()
+                    it.destroy()
+                }
+                renderTarget = renderTarget(program.width, program.height) {
+                    colorBuffer()
+                    depthBuffer()
+                }
 
-            renderTarget?.let {
-                drawer.withTarget(it) {
-                    background(program.backgroundColor ?: ColorRGBa.TRANSPARENT)
+                renderTarget?.let {
+                    drawer.withTarget(it) {
+                        background(program.backgroundColor ?: ColorRGBa.TRANSPARENT)
+                    }
                 }
             }
         }