What I expected to happen was...:
i could play minecraft normally on 1.7.9
What actually happened was...:
my minecraft crashed if i play on 1.7.9
Steps to Reproduce:
1.change the version of minecraft from any version to 1.7.9
2.try connecting to any server or try opening a single player world
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Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-38527. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.