OpenGL: Check if uniform block exists before updating it (#2581)

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -1071,8 +1071,8 @@ void RasterizerOpenGL::SetShader() {
 
         current_shader = shader_cache.emplace(config, std::move(shader)).first->second.get();
 
-        unsigned int block_index =
-            glGetUniformBlockIndex(current_shader->shader.handle, "shader_data");
+        GLuint block_index = glGetUniformBlockIndex(current_shader->shader.handle, "shader_data");
+        if (block_index != GL_INVALID_INDEX) {
             GLint block_size;
             glGetActiveUniformBlockiv(current_shader->shader.handle, block_index,
                                       GL_UNIFORM_BLOCK_DATA_SIZE, &block_size);
@@ -1103,6 +1103,7 @@ void RasterizerOpenGL::SetShader() {
 
             SyncFogColor();
         }
+    }
 }
 
 void RasterizerOpenGL::SyncCullMode() {