fix panic in span reporting #3380

Job	Run time
basic-postgres (gorm)	1m 26s
basic-postgres (xorm)	51s
basic-sqlite (gorm)	1m 8s
basic-sqlite (xorm)	43s
basic-ydb (24.1, native/query)	46s
basic-ydb (24.1, native/table)	48s
basic-ydb (24.2, native/query)	59s
basic-ydb (24.2, native/table)	43s
basic-ydb (24.3, native/query)	45s
basic-ydb (24.3, native/table)	52s
basic-ydb-database-sql (24.1, database/sql, true)	1m 4s
basic-ydb-database-sql (24.1, gorm, false)	1m 25s
basic-ydb-database-sql (24.1, gorm, true)	1m 17s
basic-ydb-database-sql (24.1, database/sql, false)	1m 1s
basic-ydb-database-sql (24.1, xorm, false)	1m 1s
basic-ydb-database-sql (24.2, database/sql, false)	50s
basic-ydb-database-sql (24.1, xorm, true)	1m 32s
basic-ydb-database-sql (24.2, database/sql, true)	53s
basic-ydb-database-sql (24.2, gorm, false)	1m 37s
basic-ydb-database-sql (24.2, gorm, true)	1m 45s
basic-ydb-database-sql (24.2, xorm, true)	1m 24s
basic-ydb-database-sql (24.2, xorm, false)	1m 0s
basic-ydb-database-sql (24.3, database/sql, false)	55s
basic-ydb-database-sql (24.3, gorm, false)	1m 45s
basic-ydb-database-sql (24.3, database/sql, true)	48s
basic-ydb-database-sql (24.3, gorm, true)	1m 22s
basic-ydb-database-sql (24.3, xorm, false)	58s
basic-ydb-database-sql (24.3, xorm, true)	1m 6s
	30m 44s

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