Merge branch 'cherry-pick-aeda2104' into 'release'

Merge branch 'XX-4101/qrCodePanic' into 'master'

See merge request !49

cyclic/group.go

@@ -17,6 +17,7 @@ import (
 	"encoding/binary"
 	"encoding/gob"
 	"encoding/json"
+	"github.com/pkg/errors"
 	jww "github.com/spf13/jwalterweatherman"
 	"gitlab.com/xx_network/crypto/csprng"
 	"gitlab.com/xx_network/crypto/large"
@@ -165,9 +166,12 @@ func (g *Group) NewIntFromBits(b large.Bits) *Int {
 func (g *Group) checkInts(ints ...*Int) {
 	for _, i := range ints {
 		if i.GetGroupFingerprint() != g.fingerprint {
-			jww.FATAL.Panicf("cyclicInt being used in wrong group! "+
+			// The error is created separately to ensure that the stack trace is
+			// printed on panic
+			err := errors.Errorf("cyclicInt being used in wrong group! "+
 				"Group fingerprint is %d and cyclicInt has %d",
 				g.fingerprint, i.GetGroupFingerprint())
+			jww.FATAL.Panicf("%+v", err)
 		}
 	}
 }