From 120e11c613c6fc1fd3116e6903008cdfb7e03cfa Mon Sep 17 00:00:00 2001
From: "a.malinovskiy" <a.malinovskiy@2Gis.ru>
Date: Thu, 16 Sep 2021 15:27:43 +0500
Subject: [PATCH 1/2] fix: panic if repeat defer mat.Close

---
 mat_noprofile.go | 3 +++
 mat_profile.go   | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/mat_noprofile.go b/mat_noprofile.go
index 5cc82a38..6e904acf 100644
--- a/mat_noprofile.go
+++ b/mat_noprofile.go
@@ -20,6 +20,9 @@ func newMat(p C.Mat) Mat {
 
 // Close the Mat object.
 func (m *Mat) Close() error {
+	if m.p == nil {
+		return nil
+	}
 	C.Mat_Close(m.p)
 	m.p = nil
 	m.d = nil
diff --git a/mat_profile.go b/mat_profile.go
index eaeaca8b..45190bb3 100644
--- a/mat_profile.go
+++ b/mat_profile.go
@@ -73,6 +73,9 @@ func newMat(p C.Mat) Mat {
 
 // Close the Mat object.
 func (m *Mat) Close() error {
+	if m.p == nil {
+		return nil
+	}
 	// NOTE: The pointer must be removed from the profile before it is deleted to
 	// avoid a data race.
 	MatProfile.Remove(m.p)

From 84f9c907aa97b7fe2d09ac2a8de7f847ba18b0f6 Mon Sep 17 00:00:00 2001
From: "a.malinovskiy" <a.malinovskiy@2Gis.ru>
Date: Thu, 16 Sep 2021 16:05:51 +0500
Subject: [PATCH 2/2] fix: error for dublicate call Close

---
 mat_noprofile.go | 3 ++-
 mat_profile.go   | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/mat_noprofile.go b/mat_noprofile.go
index 6e904acf..0d6d56a5 100644
--- a/mat_noprofile.go
+++ b/mat_noprofile.go
@@ -7,6 +7,7 @@ package gocv
 #include "core.h"
 */
 import "C"
+import "errors"
 
 // addMatToProfile does nothing if matprofile tag is not set.
 func addMatToProfile(p C.Mat) {
@@ -21,7 +22,7 @@ func newMat(p C.Mat) Mat {
 // Close the Mat object.
 func (m *Mat) Close() error {
 	if m.p == nil {
-		return nil
+		return errors.New("duplicate Mat close")
 	}
 	C.Mat_Close(m.p)
 	m.p = nil
diff --git a/mat_profile.go b/mat_profile.go
index 45190bb3..1caadd7c 100644
--- a/mat_profile.go
+++ b/mat_profile.go
@@ -74,7 +74,7 @@ func newMat(p C.Mat) Mat {
 // Close the Mat object.
 func (m *Mat) Close() error {
 	if m.p == nil {
-		return nil
+		return errors.New("duplicate Mat close")
 	}
 	// NOTE: The pointer must be removed from the profile before it is deleted to
 	// avoid a data race.