@@ -99,6 +99,10 @@ static int copy_from(IpvideoContext *s, AVFrame *src, int delta_x, int delta_y)

             motion_offset, s->upper_motion_limit_offset);

         return -1;

     }

+    if (src->data[0] == NULL) {

+        av_log(s->avctx, AV_LOG_ERROR, "Invalid decode type, corrupted header?\n");

+        return AVERROR(EINVAL);

+    }

     s->dsp.put_pixels_tab[!s->is_16bpp][0](s->pixel_ptr, src->data[0] + motion_offset,

                                            s->current_frame.linesize[0], 8);

     return 0;