--- FAIL: TestSecondUpdateAborted_FirstResultUpdateCountChanged (0.01s)
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xf04b1a]

goroutine 59 [running]:
testing.tRunner.func1.2({0x114ed80, 0x1f20880})
	/opt/hostedtoolcache/go/1.20.14/x64/src/testing/testing.go:1526 +0x24e
testing.tRunner.func1()
	/opt/hostedtoolcache/go/1.20.14/x64/src/testing/testing.go:1529 +0x39f
panic({0x114ed80, 0x1f20880})
	/opt/hostedtoolcache/go/1.20.14/x64/src/runtime/panic.go:884 +0x213
cloud.google.com/go/spanner.(*sessionPool).take(0x0, {0x1532e08, 0xc0001a6000})
	/home/runner/go/pkg/mod/cloud.google.com/go/spanner@v1.63.0/session.go:1040 +0x9a
cloud.google.com/go/spanner.(*ReadWriteTransaction).begin(0xc0050e6c00, {0x1532e08, 0xc0001a6000})
	/home/runner/go/pkg/mod/cloud.google.com/go/spanner@v1.63.0/transaction.go:1501 +0x346
cloud.google.com/go/spanner.NewReadWriteStmtBasedTransactionWithOptions({0x1532e08, 0xc0001a6000}, 0xc00058ed80, {{0x0, 0x0}, {0x0, 0x0}, 0x0, 0x0, 0x0})
	/home/runner/go/pkg/mod/cloud.google.com/go/spanner@v1.63.0/transaction.go:1757 +0x385
github.com/googleapis/go-sql-spanner.(*conn).BeginTx(0xc0000c2c60, {0x1532e08?, 0xc0001a6000}, {0xc0008fba38?, 0x3d?})
	/home/runner/work/go-sql-spanner/go-sql-spanner/driver.go:976 +0x4fb
database/sql.ctxDriverBegin({0x1532e08, 0xc0001a6000}, 0xc0008fbd70, {0x1530fd0, 0xc0000c2c60})
	/opt/hostedtoolcache/go/1.20.14/x64/src/database/sql/ctxutil.go:104 +0x7b
database/sql.(*DB).beginDC.func1()
	/opt/hostedtoolcache/go/1.20.14/x64/src/database/sql/sql.go:1868 +0xc5
database/sql.withLock({0x152e318, 0xc000eea090}, 0xc0008fbb48)
	/opt/hostedtoolcache/go/1.20.14/x64/src/database/sql/sql.go:3405 +0x8c
database/sql.(*DB).beginDC(0xc001684a90, {0x1532e08, 0xc0001a6000}, 0xc000eea090, 0xc0000e3880, 0xc0008fbc20?)
	/opt/hostedtoolcache/go/1.20.14/x64/src/database/sql/sql.go:1864 +0xcf
database/sql.(*DB).begin(0xc000092630?, {0x1532e08, 0xc0001a6000}, 0x18?, 0x0?)
	/opt/hostedtoolcache/go/1.20.14/x64/src/database/sql/sql.go:1857 +0x94
database/sql.(*DB).BeginTx.func1(0x18?)
	/opt/hostedtoolcache/go/1.20.14/x64/src/database/sql/sql.go:1836 +0x45
database/sql.(*DB).retry(0x2?, 0xc0008fbca0)
	/opt/hostedtoolcache/go/1.20.14/x64/src/database/sql/sql.go:1538 +0x[47](https://github.com/googleapis/go-sql-spanner/actions/runs/9547977184/job/26314137777?pr=256#step:4:48)
database/sql.(*DB).BeginTx(0xc0001369c0?, {0x1532e08?, 0xc0001a6000?}, 0xc00007f540?)
	/opt/hostedtoolcache/go/1.20.14/x64/src/database/sql/sql.go:1835 +0x8a
github.com/googleapis/go-sql-spanner.testSecondUpdateAborted_FirstResultChanged(0xc0001369c0, 0x0, 0xc00007f760?)
	/home/runner/work/go-sql-spanner/go-sql-spanner/aborted_transactions_test.go:773 +0x106
github.com/googleapis/go-sql-spanner.TestSecondUpdateAborted_FirstResultUpdateCountChanged(0xc000136680?)
	/home/runner/work/go-sql-spanner/go-sql-spanner/aborted_transactions_test.go:726 +0x45
testing.tRunner(0xc0001369c0, 0x13fd200)
	/opt/hostedtoolcache/go/1.20.14/x64/src/testing/testing.go:1576 +0x10b
created by testing.(*T).Run
	/opt/hostedtoolcache/go/1.20.14/x64/src/testing/testing.go:1629 +0x3ea
exit status 2
FAIL	github.com/googleapis/go-sql-spanner	0.4[55](https://github.com/googleapis/go-sql-spanner/actions/runs/9547977184/job/26314137777?pr=256#step:4:56)s
Error: Process completed with exit code 1.