diff --git a/item.go b/item.go
index 959c40a..0fd12d1 100644
--- a/item.go
+++ b/item.go
@@ -18,6 +18,10 @@ type Item[T any] struct {
 	cfg any
 	// align 64
 
+	// id only take effect on issync = True
+	id int64
+	// align 64
+
 	val T
 }
 
@@ -36,7 +40,9 @@ func (b *Item[T]) Trans() T {
 		panic("use after destroy")
 	}
 	if b.pool.issync {
-		b.stat.setinsyncop(true)
+		if !b.stat.setinsyncop(true) {
+			panic("non-unique op")
+		}
 	}
 	val := b.val
 	atomic.StoreUintptr(
@@ -51,7 +57,10 @@ func (b *Item[T]) Trans() T {
 // and will be Reset on putting back.
 func (b *Item[T]) HasInvolved() bool {
 	if b.pool.issync {
-		b.stat.setinsyncop(true)
+		if !b.stat.setinsyncop(true) && getGoroutineID() != b.id {
+			panic("non-unique op")
+		}
+		atomic.StoreInt64(&b.id, getGoroutineID())
 		defer b.stat.setinsyncop(false)
 	}
 	return b.stat.isbuffered()
@@ -65,7 +74,10 @@ func (b *Item[T]) V(f func(T)) {
 		panic("use after destroy")
 	}
 	if b.pool.issync {
-		b.stat.setinsyncop(true)
+		if !b.stat.setinsyncop(true) && getGoroutineID() != b.id {
+			panic("non-unique op")
+		}
+		atomic.StoreInt64(&b.id, getGoroutineID())
 		defer b.stat.setinsyncop(false)
 	}
 	f(b.val)
@@ -80,7 +92,10 @@ func (b *Item[T]) P(f func(*T)) {
 		panic("use after destroy")
 	}
 	if b.pool.issync {
-		b.stat.setinsyncop(true)
+		if !b.stat.setinsyncop(true) && getGoroutineID() != b.id {
+			panic("non-unique op")
+		}
+		atomic.StoreInt64(&b.id, getGoroutineID())
 		defer b.stat.setinsyncop(false)
 	}
 	f(&b.val)
@@ -93,7 +108,10 @@ func (b *Item[T]) Copy() (cb *Item[T]) {
 		panic("use after destroy")
 	}
 	if b.pool.issync {
-		b.stat.setinsyncop(true)
+		if !b.stat.setinsyncop(true) && getGoroutineID() != b.id {
+			panic("non-unique op")
+		}
+		atomic.StoreInt64(&b.id, getGoroutineID())
 		defer b.stat.setinsyncop(false)
 	}
 	cb = b.pool.New(b.cfg)
diff --git a/status.go b/status.go
index f9f3d7f..bebd0f4 100644
--- a/status.go
+++ b/status.go
@@ -1,6 +1,11 @@
 package orbyte
 
-import "sync/atomic"
+import (
+	"runtime"
+	"strconv"
+	"strings"
+	"sync/atomic"
+)
 
 const (
 	statusisbuffered = 1 << iota
@@ -16,6 +21,16 @@ func init() {
 	destroyedstatus.setdestroyed(true)
 }
 
+func getGoroutineID() int64 {
+	var buf [64]byte
+	n := runtime.Stack(buf[:], false)
+	idField := strings.Fields(string(buf[:n]))[1]
+	id, err := strconv.ParseInt(idField, 10, 64)
+	if err != nil {
+		panic(err)
+	}
+	return id
+}
 func (c status) mask(v bool, typ uintptr) (news status) {
 	news = c
 	if v {
@@ -39,22 +54,23 @@ func (c *status) setbool(v bool, typ uintptr) {
 	}
 }
 
-// setboolunique panic on non-unique set
-func (c *status) setboolunique(v bool, typ uintptr) {
+// setboolunique return false on non-unique set
+func (c *status) setboolunique(v bool, typ uintptr) bool {
 	olds := atomic.LoadUintptr((*uintptr)(c))
 	oldv := olds&typ != 0
 	if oldv == v {
-		panic("non-unique operation")
+		return false
 	}
 	news := status(olds).mask(v, typ)
 	for !atomic.CompareAndSwapUintptr((*uintptr)(c), olds, uintptr(news)) {
 		olds = atomic.LoadUintptr((*uintptr)(c))
 		oldv = olds&typ != 0
 		if oldv == v {
-			panic("non-unique operation")
+			return false
 		}
 		news = status(olds).mask(v, typ)
 	}
+	return true
 }
 
 func (c *status) loadbool(typ uintptr) bool {
@@ -77,6 +93,6 @@ func (c *status) setdestroyed(v bool) {
 	c.setbool(v, statusdestroyed)
 }
 
-func (c *status) setinsyncop(v bool) {
-	c.setboolunique(v, statusinsyncop)
+func (c *status) setinsyncop(v bool) bool {
+	return c.setboolunique(v, statusinsyncop)
 }