disable assertion
diff --git a/progs/demos/fslight.c b/progs/demos/fslight.c
index 2fa25a0..b03ba23 100644
--- a/progs/demos/fslight.c
+++ b/progs/demos/fslight.c
@@ -507,7 +507,7 @@
 
    glUniform4fv_func(uDiffuse, 1, diffuse);
    glUniform4fv_func(uSpecular, 1, specular);
-   assert(glGetError() == 0);
+   /*   assert(glGetError() == 0);*/
    glUniform1i_func(uTexture, 2);  /* use texture unit 2 */
    /*assert(glGetError() == 0);*/