diff --git a/lib/src/parser.c b/lib/src/parser.c
index efb10123..7a30c204 100644
--- a/lib/src/parser.c
+++ b/lib/src/parser.c
@@ -1525,6 +1525,8 @@ TSParser *ts_parser_new(void) {
 }
 
 void ts_parser_delete(TSParser *self) {
+  if (!self) return;
+
   ts_stack_delete(self->stack);
   if (self->reduce_actions.contents) {
     array_delete(&self->reduce_actions);
diff --git a/lib/src/tree.c b/lib/src/tree.c
index 9f294412..04cb1d24 100644
--- a/lib/src/tree.c
+++ b/lib/src/tree.c
@@ -29,6 +29,8 @@ TSTree *ts_tree_copy(const TSTree *self) {
 }
 
 void ts_tree_delete(TSTree *self) {
+  if (!self) return;
+
   SubtreePool pool = ts_subtree_pool_new(0);
   ts_subtree_release(&pool, self->root);
   ts_subtree_pool_delete(&pool);