2 files changed, 3 insertions, 1 deletions

diff --git a/src/ast.c b/src/ast.c
index 9c13d79..eced7f3 100644
--- a/src/ast.c
+++ b/src/ast.c
@@ -246,4 +246,4 @@ void imp_ast_list_destroy(IMP_ASTNodeList *list) {
   imp_ast_destroy(list->node);
   imp_ast_list_destroy(list->next);
   free(list);
-}
\ No newline at end of file
+}
diff --git a/src/driver.c b/src/driver.c
index c43b899..d8cd143 100644
--- a/src/driver.c
+++ b/src/driver.c
@@ -20,6 +20,7 @@ int imp_driver_interpret_file (IMP_InterpreterContext *context, const char *path
   yyin = fopen(path, "r");
   if (!yyin) return -1;
   yyrestart(yyin);
+  ast_root = NULL;
   if (yyparse()) {
     imp_ast_destroy(ast_root);
     fclose(yyin);
@@ -37,6 +38,7 @@ int imp_driver_interpret_file (IMP_InterpreterContext *context, const char *path
 
 int imp_driver_interpret_str (IMP_InterpreterContext *context, const char *str) {
   YY_BUFFER_STATE buf = yy_scan_string(str);
+  ast_root = NULL;
   if (yyparse()) {
     imp_ast_destroy(ast_root);
     yy_delete_buffer(buf);