1 files changed, 13 insertions, 0 deletions
diff --git a/src/writer.c b/src/writer.c
index dc41d522..7201c976 100644
--- a/src/writer.c
+++ b/src/writer.c
@@ -1330,6 +1330,8 @@ serd_writer_on_event(SerdWriter* writer, const SerdEvent* event)
 SerdStatus
 serd_writer_finish(SerdWriter* writer)
 {
+  assert(writer);
+
   const SerdStatus st0 = terminate_context(writer);
   const SerdStatus st1 = serd_byte_sink_flush(&writer->byte_sink);
 
@@ -1347,6 +1349,10 @@ serd_writer_new(SerdWorld*      world,
                 SerdWriteFunc   ssink,
                 void*           stream)
 {
+  assert(world);
+  assert(env);
+  assert(ssink);
+
   const size_t       max_depth = world->limits.writer_max_depth;
   const WriteContext context   = WRITE_CONTEXT_NULL;
   SerdWriter*        writer    = (SerdWriter*)calloc(1, sizeof(SerdWriter));
@@ -1375,6 +1381,8 @@ serd_writer_new(SerdWorld*      world,
 void
 serd_writer_chop_blank_prefix(SerdWriter* writer, const char* prefix)
 {
+  assert(writer);
+
   free(writer->bprefix);
   writer->bprefix_len = 0;
   writer->bprefix     = NULL;
@@ -1390,6 +1398,8 @@ serd_writer_chop_blank_prefix(SerdWriter* writer, const char* prefix)
 SERD_NODISCARD static SerdStatus
 serd_writer_set_base_uri(SerdWriter* writer, const SerdNode* uri)
 {
+  assert(writer);
+
   if (uri && serd_node_type(uri) != SERD_URI) {
     return SERD_BAD_ARG;
   }
@@ -1419,6 +1429,8 @@ serd_writer_set_base_uri(SerdWriter* writer, const SerdNode* uri)
 SerdStatus
 serd_writer_set_root_uri(SerdWriter* writer, const SerdNode* uri)
 {
+  assert(writer);
+
   serd_node_free(writer->root_node);
   writer->root_node = NULL;
   writer->root_uri  = SERD_URI_NULL;
@@ -1476,6 +1488,7 @@ serd_writer_free(SerdWriter* writer)
 const SerdSink*
 serd_writer_sink(SerdWriter* writer)
 {
+  assert(writer);
   return &writer->iface;
 }