使用cocos2d－x lua 3.6编写的游戏，接入列个adcolony的视频广告系统，点击她的广告，弹出一个网页，然后点击跳转到appstore，然后切回游戏，渲染卡死了，log输出如下错误
2016-07-17 12:31:40.642 Digger iOS[10119:60b] failed to call context
2016-07-17 12:31:40.646 Digger iOS[10119:60b] cocos2d: surface size: 960x640
2016-07-17 12:31:40.648 Digger iOS[10119:60b] Failed to make complete framebuffer object 0x8CDD
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp saveRenderState 156
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp restoreRenderState 182
OpenGL error 0x0506 in -[CCEAGLView swapBuffers] 324
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp saveRenderState 156
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp restoreRenderState 182
OpenGL error 0x0506 in -[CCEAGLView swapBuffers] 324
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp saveRenderState 156
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp restoreRenderState 182
OpenGL error 0x0506 in -[CCEAGLView swapBuffers] 324
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp saveRenderState 156
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp restoreRenderState 182
OpenGL error 0x0506 in -[CCEAGLView swapBuffers] 324
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp saveRenderState 156
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp restoreRenderState 182
OpenGL error 0x0506 in -[CCEAGLView swapBuffers] 324
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp saveRenderState 156
OpenGL error 0x0506 in /Users/xiaobei/Project/Digger/Program/Digger/frameworks/cocos2d-x/cocos/renderer/CCRenderer.cpp restoreRenderState 182