diff --git a/ast.c b/ast.c
index 913e852..5c42a30 100644
--- a/ast.c
+++ b/ast.c
@@ -1563,7 +1563,7 @@ bool ast_global_codegen(ast_value *self, ir_builder *ir, bool isfield)
     return true;
 
 error: /* clean up */
-    ir_value_delete(v);
+    if(v) ir_value_delete(v);
     return false;
 }
 
diff --git a/main.c b/main.c
index bcd9159..ab9520a 100644
--- a/main.c
+++ b/main.c
@@ -791,7 +791,7 @@ cleanup:
     vec_free(ppems);
 
     if (!OPTS_OPTION_BOOL(OPTION_PP_ONLY))
-        parser_cleanup(parser);
+        if(parser) parser_cleanup(parser);
     if (opts_output_free)
         mem_d(OPTS_OPTION_STR(OPTION_OUTPUT));
     if (operators_free)
diff --git a/parser.c b/parser.c
index 14f7803..6216997 100644
--- a/parser.c
+++ b/parser.c
@@ -3622,7 +3622,8 @@ static bool parse_goto(parser_t *parser, ast_expression **out)
         if (!(expression = parse_expression(parser, false, true)) ||
             !(*out = parse_goto_computed(parser, &expression))) {
             parseerror(parser, "invalid goto expression");
-            ast_unref(expression);
+            if(expression)
+                ast_unref(expression);
             return false;
         }