diff --git a/src/vrend_renderer.c b/src/vrend_renderer.c
index 1093bb3..f0971ee 100644
--- a/src/vrend_renderer.c
+++ b/src/vrend_renderer.c
@@ -5302,8 +5302,10 @@ void *vrend_renderer_get_cursor_contents(uint32_t res_handle, uint32_t *width, u
    if (res->target != GL_TEXTURE_2D)
       return NULL;
 
-   *width = res->base.width0;
-   *height = res->base.height0;
+   if (width)
+     *width = res->base.width0;
+   if (height)
+     *height = res->base.height0;
    format = tex_conv_table[res->base.format].glformat;
    type = tex_conv_table[res->base.format].gltype; 
    blsize = util_format_get_blocksize(res->base.format);