Segfault when low memory event fires

To reproduce (On Nexus 7 (2012) at least, not sure how to trigger a low memory event on other devices)

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• Open Minecraft PE

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• Go to Settings

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• Skins

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• Custom

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• When the browser for skins shows up, hit the back button

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• Once back in MCPE, hit the Multitask button

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Expected:

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• MCPE gets placed in background
  
  0Actual:

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• MCPE force-closes with this stack trace: https://gist.github.com/zhuowei/e9a43e30ba268dfdf192

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It looks like the low memory handler tried to destroy the LevelRenderer, but since no world has been loaded, the LevelRenderer was null and the destructor segfaulted.

To reproduce (On Nexus 7 (2012) at least, not sure how to trigger a low memory event on other devices)

0

0
• Open Minecraft PE

0
• Go to Settings

0
• Skins

0
• Custom

0
• When the browser for skins shows up, hit the back button

0
• Once back in MCPE, hit the Multitask button

0

0

Expected:

0

0
• MCPE gets placed in background
  0Actual:

0

0

Actual:

0

0
0
• MCPE force-closes with this stack trace: https://gist.github.com/zhuowei/e9a43e30ba268dfdf192

0

0

It looks like the low memory handler tried to destroy the LevelRenderer, but since no world has been loaded, the LevelRenderer was null and the destructor segfaulted.