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-rw-r--r--src/parse/mq.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/parse/mq.c b/src/parse/mq.c
index f3510c1..c5e353d 100644
--- a/src/parse/mq.c
+++ b/src/parse/mq.c
@@ -117,6 +117,10 @@ static css_error mq_parse_ratio(
num = css__number_from_lwc_string(numerator->idata, true, &num_len);
den = css__number_from_lwc_string(token->idata, true, &den_len);
+ if (num == 0 || den == 0) {
+ return CSS_INVALID;
+ }
+
*ratio = css_divide_fixed(num, den);
return CSS_OK;