--- a/render_png.c	Sat Jun 07 05:18:06 2008 +0300
+++ b/render_png.c	Sun Jun 08 21:03:23 2008 +0300
@@ -104,7 +104,7 @@
     return 0;
 
 error:
-    _render_png_free(ctx);
+    // don't free it here, our user needs to do that
     return -1;
 }
 
@@ -139,6 +139,7 @@
     return 0;
 
 error:
+    free(ctx);
     return -1;
 }