diff --git a/process/process_linux.go b/process/process_linux.go
index 7ec1bc5..341420b 100644
--- a/process/process_linux.go
+++ b/process/process_linux.go
@@ -1175,6 +1175,9 @@ func (p *Process) fillFromTIDStatWithContext(ctx context.Context, tid int32) (ui
 	createTime := int64(ctime * 1000)
 
 	rtpriority, err := strconv.ParseInt(fields[i+16], 10, 32)
+	if err != nil {
+		return 0, 0, nil, 0, 0, 0, err
+	}
 	if rtpriority < 0 {
 		rtpriority = rtpriority*-1 - 1
 	} else {
diff --git a/process/process_posix.go b/process/process_posix.go
index d058278..8ffb6b7 100644
--- a/process/process_posix.go
+++ b/process/process_posix.go
@@ -26,6 +26,9 @@ func getTerminalMap() (map[uint64]string, error) {
 	defer d.Close()
 
 	devnames, err := d.Readdirnames(-1)
+	if err != nil {
+		return nil, err
+	}
 	for _, devname := range devnames {
 		if strings.HasPrefix(devname, "/dev/tty") {
 			termfiles = append(termfiles, "/dev/tty/"+devname)
@@ -45,6 +48,9 @@ func getTerminalMap() (map[uint64]string, error) {
 	if ptsnames == nil {
 		defer ptsd.Close()
 		ptsnames, err = ptsd.Readdirnames(-1)
+		if err != nil {
+			return nil, err
+		}
 		for _, ptsname := range ptsnames {
 			termfiles = append(termfiles, "/dev/pts/"+ptsname)
 		}
diff --git a/process/process_test.go b/process/process_test.go
index d8eb483..7cdcedb 100644
--- a/process/process_test.go
+++ b/process/process_test.go
@@ -85,6 +85,9 @@ func Test_Process_memory_maps(t *testing.T) {
 	checkPid := os.Getpid()
 
 	ret, err := NewProcess(int32(checkPid))
+	if err != nil {
+		t.Errorf("error %v", err)
+	}
 
 	mmaps, err := ret.MemoryMaps(false)
 	if err != nil {
diff --git a/process/process_windows.go b/process/process_windows.go
index 9304e2d..e81d67d 100644
--- a/process/process_windows.go
+++ b/process/process_windows.go
@@ -270,6 +270,9 @@ func (p *Process) UsernameWithContext(ctx context.Context) (string, error) {
 	}
 	defer token.Close()
 	tokenUser, err := token.GetTokenUser()
+	if err != nil {
+		return "", err
+	}
 
 	user, domain, _, err := tokenUser.User.Sid.LookupAccount("")
 	return domain + "\\" + user, err