From 4938ab786e9676cb76906d51fe6cf8f8a707cdb2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Henrik=20Rydg=C3=A5rd?= <hrydgard@gmail.com>
Date: Fri, 25 Aug 2017 22:49:51 +0200
Subject: [PATCH] Fix possible crash when loading GL shader caches. Should help
 #9930.

---
 GPU/GLES/ShaderManagerGLES.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/GPU/GLES/ShaderManagerGLES.cpp b/GPU/GLES/ShaderManagerGLES.cpp
index c0edd4608676..7b1e447633f7 100644
--- a/GPU/GLES/ShaderManagerGLES.cpp
+++ b/GPU/GLES/ShaderManagerGLES.cpp
@@ -1023,7 +1023,11 @@ void ShaderManagerGLES::LoadAndPrecompile(const std::string &filename) {
 			delete vs;
 			return;
 		}
-		vsCache_.Insert(id, vs);
+		if (!vsCache_.Get(id)) {
+			vsCache_.Insert(id, vs);
+		} else {
+			WARN_LOG(G3D, "Duplicate vertex shader found in GL shader cache, ignoring");
+		}
 	}
 	for (int i = 0; i < header.numFragmentShaders; i++) {
 		ShaderID id;
@@ -1031,7 +1035,11 @@ void ShaderManagerGLES::LoadAndPrecompile(const std::string &filename) {
 			ERROR_LOG(G3D, "Truncated shader cache file, aborting.");
 			return;
 		}
-		fsCache_.Insert(id, CompileFragmentShader(id));
+		if (!fsCache_.Get(id)) {
+			fsCache_.Insert(id, CompileFragmentShader(id));
+		} else {
+			WARN_LOG(G3D, "Duplicate fragment shader found in GL shader cache, ignoring");
+		}
 	}
 	for (int i = 0; i < header.numLinkedPrograms; i++) {
 		ShaderID vsid, fsid;