1 files changed, 4 insertions, 0 deletions
diff --git a/src/nodes.c b/src/nodes.c
index a7d0ab2b..5c6492e4 100644
--- a/src/nodes.c
+++ b/src/nodes.c
@@ -225,6 +225,8 @@ serd_nodes_free(SerdNodes* nodes)
 size_t
 serd_nodes_size(const SerdNodes* nodes)
 {
+  assert(nodes);
+
   return zix_hash_size(nodes->hash);
 }
 
@@ -257,6 +259,8 @@ serd_nodes_intern(SerdNodes* nodes, const SerdNode* node)
 const SerdNode*
 serd_nodes_get(const SerdNodes* const nodes, const SerdNode* const node)
 {
+  assert(nodes);
+
   if (!node) {
     return NULL;
   }