@@ -709,7 +709,8 @@ static av_cold void uninit(AVFilterContext *ctx)

     av_expr_free(s->x_pexpr);

     av_expr_free(s->y_pexpr);

-    s->x_pexpr = s->y_pexpr = NULL;

+    av_expr_free(s->a_pexpr);

+    s->x_pexpr = s->y_pexpr = s->a_pexpr = NULL;

     av_freep(&s->positions);

     s->nb_positions = 0;

@@ -752,7 +753,8 @@ static int config_input(AVFilterLink *inlink)

     av_expr_free(s->x_pexpr);

     av_expr_free(s->y_pexpr);

-    s->x_pexpr = s->y_pexpr = NULL;

+    av_expr_free(s->a_pexpr);

+    s->x_pexpr = s->y_pexpr = s->a_pexpr = NULL;

     if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,

                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||