@@ -120,9 +120,10 @@ static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf,

         }else{  /* inter using last frame as reference */

             int xoffset = (buf[i] & 0xF) - 7;

             int yoffset = ((buf[i] >> 4)) - 7;

-            cmv_motcomp(frame->data[0], frame->linesize[0],

-                      s->last_frame->data[0], s->last_frame->linesize[0],

-                      x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);

+            if (s->last_frame->data[0])

+                cmv_motcomp(frame->data[0], frame->linesize[0],

+                            s->last_frame->data[0], s->last_frame->linesize[0],

+                            x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);

         }

         i++;

     }