in_sql: add nil guard in shutdown#176
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`@thread` is assigned only on the last line of `#start`, so any shutdown that runs on an instance whose `#start` never reached that line calls `@thread.join` on nil and raises "undefined method `join' for nil:NilClass". Signed-off-by: Shizuo Fujita <fujita@clear-code.com>
kenhys
approved these changes
Jul 9, 2026
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@threadis assigned only on the last line of#start,so any shutdown that runs on an instance whose
#startnever reached that line calls@thread.joinon nil and raises "undefined method `join' for nil:NilClass".Fix #154