diff --git a/src/picom.c b/src/picom.c
index 44376dd3..27598edc 100644
--- a/src/picom.c
+++ b/src/picom.c
@@ -2226,7 +2226,10 @@ static void session_destroy(session_t *ps) {
 		unredirect(ps);
 	}
 
+#ifdef CONFIG_OPENGL
 	free(ps->argb_fbconfig);
+	ps->argb_fbconfig = NULL;
+#endif
 
 	file_watch_destroy(ps->loop, ps->file_watch_handle);
 	ps->file_watch_handle = NULL;