The game client freezes and crashed when "Quit" button is pressed on NixOS

[cloudyluna]

Clicking the main menu's quit button on NixOS freezes the game for 10 to 20 seconds and eventually exits with Segmentation fault (core dumped) on the console.

Later on, I tried reproducing this in lldb debugger, and the game raised this info on exit:

* thread #1, name = 'OneLife', stop reason = signal SIGSEGV: address not mapped to object (fault address: 0x0)
    frame #0: 0x0000555555740c6d OneLife`freeSprite(inSprite=0x0000000000000000) at gameGraphicsGL.cpp:660:35

A workaround that I came up with (I had to compile the game from the source) is to let freeSprite do its thing only if the passed argument is not a null pointer.

In minorGems:

diff --git a/game/platforms/openGL/gameGraphicsGL.cpp b/game/platforms/openGL/gameGraphicsGL.cpp
index 83e9659..ac411ee 100644
--- a/game/platforms/openGL/gameGraphicsGL.cpp
+++ b/game/platforms/openGL/gameGraphicsGL.cpp
@@ -657,8 +657,10 @@ SpriteHandle fillSpriteAlphaOnly( unsigned char *inA,
 
 void freeSprite( SpriteHandle inSprite ) {
     SpriteGL *s = (SpriteGL *)inSprite;
-    totalLoadedTextureBytes -= s->mWidth * s->mHeight * 4;
-    delete ( s );
+    if (s != nullptr) {
+      totalLoadedTextureBytes -= s->mWidth * s->mHeight * 4;
+      delete ( s );
+      }
     }