diff --git a/third_party/libopenjpeg20/jp2.c b/third_party/libopenjpeg20/jp2.c
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index f3baca5..3bcb42e 100644
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--- a/third_party/libopenjpeg20/jp2.c
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+++ b/third_party/libopenjpeg20/jp2.c
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@@ -896,8 +896,12 @@ static OPJ_BOOL opj_jp2_check_color(opj_image_t *image, opj_jp2_color_t *color,
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}
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/* verify that no component is targeted more than once */
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for (i = 0; i < nr_channels; i++) {
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- OPJ_UINT16 pcol = cmap[i].pcol;
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- assert(cmap[i].mtyp == 0 || cmap[i].mtyp == 1);
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+ if (cmap[i].mtyp != 0 && cmap[i].mtyp != 1) {
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+ opj_event_msg(p_manager, EVT_ERROR, "Unexpected MTYP value.\n");
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+ opj_free(pcol_usage);
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+ return OPJ_FALSE;
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+ }
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+ OPJ_UINT16 pcol = cmap[i].pcol;
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if (pcol >= nr_channels) {
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opj_event_msg(p_manager, EVT_ERROR, "Invalid component/palette index for direct mapping %d.\n", pcol);
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is_sane = OPJ_FALSE;
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