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-rw-r--r--src/time64.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/time64.c b/src/time64.c
index 07639df..cfbe7ac 100644
--- a/src/time64.c
+++ b/src/time64.c
@@ -224,6 +224,7 @@ Time64_T timegm64(const struct TM *date) {
Time64_T days = 0;
Time64_T seconds = 0;
Year year;
+ assert(date != NULL);
Year orig_year = (Year)date->tm_year;
int cycles = 0;