Fix a panic (out of range on sharing credentials)

model/sharing/invitation.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net/url"
+	"runtime/debug"
 	"time"
 
 	"github.com/cozy/cozy-stack/model/instance"
@@ -38,6 +39,12 @@ func (s *Sharing) SendInvitations(inst *instance.Instance, perms *permission.Per
 		}
 		state := s.Credentials[i-1].State
 		g.Go(func() error {
+			defer func() {
+				if r := recover(); r != nil {
+					inst.Logger().Errorf("[panic] %v: %s", r, debug.Stack())
+				}
+			}()
+
 			link := m.InvitationLink(inst, s, state, perms)
 			if m.Instance != "" && canSendShortcut {
 				if err := m.SendShortcut(inst, s, link); err == nil {

model/sharing/member.go

@@ -628,6 +628,10 @@ func (s *Sharing) FindMemberByInboundClientID(clientID string) (*Member, error)
 
 // FindCredentials returns the credentials for the given member
 func (s *Sharing) FindCredentials(m *Member) *Credentials {
+	if len(s.Credentials) == 0 {
+		return nil
+	}
+
 	if s.Owner {
 		for i, member := range s.Members {
 			if i > 0 && m.Same(member) {

model/sharing/replicator.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
+	"runtime/debug"
 	"strings"
 	"time"
 
@@ -62,6 +63,11 @@ func (s *Sharing) Replicate(inst *instance.Instance, errors int) error {
 			}
 			m := &s.Members[i]
 			g.Go(func() error {
+				defer func() {
+					if r := recover(); r != nil {
+						inst.Logger().Errorf("[panic] %v: %s", r, debug.Stack())
+					}
+				}()
 				if m.Status == MemberStatusReady {
 					p, err := s.ReplicateTo(inst, m, false)
 					if err != nil {

model/sharing/upload.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"runtime/debug"
 	"strings"
 
 	"github.com/cozy/cozy-stack/client/request"
@@ -63,6 +64,11 @@ func (s *Sharing) Upload(inst *instance.Instance, ctx context.Context, errors in
 	for i := range members {
 		m := members[i]
 		g.Go(func() error {
+			defer func() {
+				if r := recover(); r != nil {
+					inst.Logger().Errorf("[panic] %v: %s", r, debug.Stack())
+				}
+			}()
 			more, err := s.UploadBatchTo(inst, ctx, m, lastTry)
 			if err != nil {
 				return err