When trying to break blocks Minecraft sometimes crashes.Also in survival you can't break blocks with bare hands.
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Dinnerbone fixed this :)Just re-download the snapshot
MC-7640
Minecraft crashes when breaking blocks(2 bugs)
Resolved
Duplicate
0
Ville Selkämaa
(Unassigned)
Unconfirmed
block
Snapshot 13w03a
Retrieved
Based on a crash report provided in this issue, I believe with high certainty that this report may be a duplicate of MC-7622. If I am wrong, please go yell at Dinnerbone.