2 files changed, 5 insertions, 2 deletions
diff --git a/src/sord.c b/src/sord.c
index 87dfb10..e32c382 100644
--- a/src/sord.c
+++ b/src/sord.c
@@ -1009,6 +1009,10 @@ sord_node_from_serd_node(SordWorld*      world,
                          const SerdNode* datatype,
                          const SerdNode* lang)
 {
+	if (!sn) {
+		return NULL;
+	}
+
 	SordNode* datatype_node = NULL;
 	SordNode* ret           = NULL;
 	switch (sn->type) {
@@ -1023,7 +1027,7 @@ sord_node_from_serd_node(SordWorld*      world,
 			sn->n_bytes,
 			sn->n_chars,
 			sn->flags,
-			(const char*)lang->buf);
+			lang ? (const char*)lang->buf : NULL);
 		sord_node_free(world, datatype_node);
 		return ret;
 	case SERD_URI:
diff --git a/src/syntax.c b/src/syntax.c
index eb9600f..e69607f 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -70,7 +70,6 @@ event_statement(void*              handle,
 
 	SordNode* g = NULL;
 	if (state->graph_uri_node) {
-		assert(graph->type == SERD_NOTHING);
 		g = sord_node_copy(state->graph_uri_node);
 	} else {
 		g = (graph && graph->buf)