diff --git a/src/hash.c b/src/hash.c
index 91fc3d67..2a9c175c 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -101,6 +101,8 @@ void hash_delete(hash_t *hash, const void *key) {
 /* Utility functions */
 
 void hash_clear(hash_t *hash) {
+	if (!hash)
+		return;
 	memset(hash->values, 0, hash->n * sizeof *hash->values);
 }