diff --git a/try/out.go b/try/out.go
index b6fc059..675ab26 100644
--- a/try/out.go
+++ b/try/out.go
@@ -40,14 +40,17 @@ type (
 //
 //	error sending response: UDP not listening
 func (o *Result) Logf(a ...any) *Result {
-	if o.Err == nil || len(a) == 0 {
+	if o.Err == nil {
 		return o
 	}
-	f, isFormat := a[0].(string)
-	if isFormat {
-		s := fmt.Sprintf(f+": %v", append(a[1:], o.Err)...)
-		_ = handler.LogOutput(2, s)
+	s := o.Err.Error()
+	if len(a) != 0 {
+		f, isFormat := a[0].(string)
+		if isFormat {
+			s = fmt.Sprintf(f+": %v", append(a[1:], o.Err)...)
+		}
 	}
+	_ = handler.LogOutput(2, s)
 	return o
 }
 
diff --git a/try/result2_test.go b/try/result2_test.go
index d1b1527..9853cdd 100644
--- a/try/result2_test.go
+++ b/try/result2_test.go
@@ -21,7 +21,7 @@ func ExampleResult2_Logf() {
 	err2.SetLogTracer(os.Stdout)
 
 	countSomething := func(s1, s2 string) (int, int) {
-		r := try.Out2(convTwoStr(s1, s2)).Logf("not number").Def2(10, 10)
+		r := try.Out2(convTwoStr(s1, s2)).Logf().Def2(10, 10)
 		v1, v2 := r.Val1, r.Val2
 		return v1 + v2, v2
 	}
@@ -29,6 +29,6 @@ func ExampleResult2_Logf() {
 	num1, num2 := countSomething("WRONG", "2")
 	fmt.Printf("results: %d, %d", num1, num2)
 	err2.SetLogTracer(nil)
-	// Output: not number: testing run example: strconv.Atoi: parsing "WRONG": invalid syntax
+	// Output: testing run example: strconv.Atoi: parsing "WRONG": invalid syntax
 	// results: 20, 10
 }