From 4685bbbd4e3eeea703d9db477fdceed081fc70de Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=9B=BE=E9=9B=A8=E9=AD=94=E7=90=86=E6=B2=99?=
 <lolisa@marisa.moe>
Date: Wed, 24 Oct 2018 21:20:57 -0700
Subject: [PATCH] [Relay] fix error in typesolver

---
 src/relay/pass/type_solver.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/relay/pass/type_solver.h b/src/relay/pass/type_solver.h
index 30f82f980a75..193a5976a275 100644
--- a/src/relay/pass/type_solver.h
+++ b/src/relay/pass/type_solver.h
@@ -128,7 +128,7 @@ class TypeSolver {
       if (this->parent == nullptr) return this;
       // slow path with path compression.
       TypeNode* root = this;
-      while (root->parent != nullptr) {
+      while (root->parent != nullptr && root->parent != root) {
         root = root->parent;
       }
       for (TypeNode* p = this; p != root;) {