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diff --git a/third_party/libopenjpeg20/j2k.c b/third_party/libopenjpeg20/j2k.c
index 9056feb..c7aa8db 100644
--- a/third_party/libopenjpeg20/j2k.c
+++ b/third_party/libopenjpeg20/j2k.c
@@ -8744,7 +8744,9 @@ static OPJ_BOOL opj_j2k_read_SPCod_SPCoc( opj_j2k_t *p_j2k,
p_j2k->m_specific_param.m_decoder.m_default_tcp;
/* precondition again */
- assert(compno < p_j2k->m_private_image->numcomps);
+ if (compno >= p_j2k->m_private_image->numcomps) {
+ return OPJ_FALSE;
+ }
l_tccp = &l_tcp->tccps[compno];
l_current_ptr = p_header_data;
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