``` crow5k:modernsqlite $ cat go.mod module play go 1.16 require modernc.org/sqlite v1.10.4 // indirect crow5k:modernsqlite $ go run repro.go 1 2 3 4 5 6 7 8 panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x10db2c5] goroutine 1 [running]: modernc.org/memory.(*Allocator).UintptrFree(0x1505380, 0x9000790, 0x0, 0x0) /Users/bradfitz/pkg/mod/modernc.org/memory@v1.0.4/memory.go:289 +0x105 modernc.org/libc.Xfree(0xc0005aa0a0, 0x9000790) /Users/bradfitz/pkg/mod/modernc.org/libc@v1.9.5/mem.go:85 +0x87 modernc.org/sqlite.(*conn).free(...) /Users/bradfitz/pkg/mod/modernc.org/sqlite@v1.10.4/sqlite.go:1173 modernc.org/sqlite.(*rows).Close(0xc000060960, 0xc00008e500, 0x1504f00) /Users/bradfitz/pkg/mod/modernc.org/sqlite@v1.10.4/sqlite.go:198 +0x69 database/sql.(*Rows).close.func1() /Users/bradfitz/go/src/database/sql/sql.go:3178 +0x3c database/sql.withLock(0x1359d10, 0xc0004c8000, 0xc000107e18) /Users/bradfitz/go/src/database/sql/sql.go:3294 +0x69 database/sql.(*Rows).close(0xc00008e500, 0x0, 0x0, 0x0, 0x0) /Users/bradfitz/go/src/database/sql/sql.go:3177 +0x114 database/sql.(*Rows).Close(...) /Users/bradfitz/go/src/database/sql/sql.go:3161 database/sql.(*Row).Scan(0xc0005a60f0, 0xc000107f48, 0x1, 0x1, 0x0, 0x0) /Users/bradfitz/go/src/database/sql/sql.go:3242 +0x18c main.main() /Users/bradfitz/hack/modernsqlite/repro.go:42 +0x46f exit status 2 crow5k:modernsqlite $ cat repro.go package main import ( "database/sql" "fmt" "log" "os" _ "modernc.org/sqlite" ) func main() { os.Remove("x.sqlite") db, err := sql.Open("sqlite", "x.sqlite") if err != nil { log.Fatal(err) } if _, err := db.Exec(` CREATE TABLE IF NOT EXISTS loginst ( instid INTEGER PRIMARY KEY, name VARCHAR UNIQUE ); `); err != nil { log.Fatal(err) } tx, err := db.Begin() if err != nil { log.Fatal(err) } for i := 0; i < 5000; i++ { x := fmt.Sprint("foo%d", i) var id int if err := tx.QueryRow("INSERT OR IGNORE INTO loginst (name) VALUES (?); SELECT instid FROM loginst WHERE name = ?", x, x).Scan(&id); err != nil { log.Fatal(err) } fmt.Println(id) } } ```