vb2_dst = hantro_get_dst_buf(ctx);
 
        ref = hantro_get_ref(ctx, hdr->last_frame_ts);
-       if (!ref)
+       if (!ref) {
+               vpu_debug(0, "failed to find last frame ts=%llu\n",
+                         hdr->last_frame_ts);
                ref = vb2_dma_contig_plane_dma_addr(&vb2_dst->vb2_buf, 0);
+       }
        vdpu_write_relaxed(vpu, ref, G1_REG_ADDR_REF(0));
 
        ref = hantro_get_ref(ctx, hdr->golden_frame_ts);
-       WARN_ON(!ref && hdr->golden_frame_ts);
+       if (!ref && hdr->golden_frame_ts)
+               vpu_debug(0, "failed to find golden frame ts=%llu\n",
+                         hdr->golden_frame_ts);
        if (!ref)
                ref = vb2_dma_contig_plane_dma_addr(&vb2_dst->vb2_buf, 0);
        if (hdr->flags & V4L2_VP8_FRAME_FLAG_SIGN_BIAS_GOLDEN)
        vdpu_write_relaxed(vpu, ref, G1_REG_ADDR_REF(4));
 
        ref = hantro_get_ref(ctx, hdr->alt_frame_ts);
-       WARN_ON(!ref && hdr->alt_frame_ts);
+       if (!ref && hdr->alt_frame_ts)
+               vpu_debug(0, "failed to find alt frame ts=%llu\n",
+                         hdr->alt_frame_ts);
        if (!ref)
                ref = vb2_dma_contig_plane_dma_addr(&vb2_dst->vb2_buf, 0);
        if (hdr->flags & V4L2_VP8_FRAME_FLAG_SIGN_BIAS_ALT)
 
        vb2_dst = hantro_get_dst_buf(ctx);
 
        ref = hantro_get_ref(ctx, hdr->last_frame_ts);
-       if (!ref)
+       if (!ref) {
+               vpu_debug(0, "failed to find last frame ts=%llu\n",
+                         hdr->last_frame_ts);
                ref = vb2_dma_contig_plane_dma_addr(&vb2_dst->vb2_buf, 0);
+       }
        vdpu_write_relaxed(vpu, ref, VDPU_REG_VP8_ADDR_REF0);
 
        ref = hantro_get_ref(ctx, hdr->golden_frame_ts);
-       WARN_ON(!ref && hdr->golden_frame_ts);
+       if (!ref && hdr->golden_frame_ts)
+               vpu_debug(0, "failed to find golden frame ts=%llu\n",
+                         hdr->golden_frame_ts);
        if (!ref)
                ref = vb2_dma_contig_plane_dma_addr(&vb2_dst->vb2_buf, 0);
        if (hdr->flags & V4L2_VP8_FRAME_FLAG_SIGN_BIAS_GOLDEN)
        vdpu_write_relaxed(vpu, ref, VDPU_REG_VP8_ADDR_REF2_5(2));
 
        ref = hantro_get_ref(ctx, hdr->alt_frame_ts);
-       WARN_ON(!ref && hdr->alt_frame_ts);
+       if (!ref && hdr->alt_frame_ts)
+               vpu_debug(0, "failed to find alt frame ts=%llu\n",
+                         hdr->alt_frame_ts);
        if (!ref)
                ref = vb2_dma_contig_plane_dma_addr(&vb2_dst->vb2_buf, 0);
        if (hdr->flags & V4L2_VP8_FRAME_FLAG_SIGN_BIAS_ALT)