Console spam when synchronization fails

[BrainStone]

Issue Description:

When the synchronization fails for any reason the console is spammed like crazy.

What happens:

Console spam when an exception occurs during synchronization

What you expected to happen:

The error appearing only once.

Steps to reproduce:

1. Do anything to trigger an exception during the synchronization (like putting in an error manually)
2. Join (to trigger synchronization)
3. Watch the console spam...

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Affected Versions (Do not use "latest"):

• Minecraft: 1.11.2
• InvSync: 0.5.42
• Sponge: SpongeVanilla-1.11.2-7.0.0-BETA-268