Weird crash on present modally a view controller on iOS 7 - ios

Question

I developed an app using a iOS 9 device for testing and everything is fine, but I need the compatibility with iOS 7 also.
At the start I load a view controller with some buttons, one of them should present modally another controller but on iOS 7 device I get a very weird crash:
Objective: {objective 0x165f98c0: <> +
<750:-6.61817e-08>*0x16569cd0.negError{id: 118} +
<999:2>*0x16569ec0.negError{id: 175} + <999:2>0x16570520.negError{id:
172} + <999:1>_UILayoutGuide:0x1655a6c0.Width{id: 176} +
<999:1>*_UILayoutGuide:0x165a3c70.Width{id: 173}} 2016-04-27
15:38:07.483 191PerTe[502:60b] *** Terminating app due to uncaught
exception 'NSInternalInconsistencyException', reason: '{ Rows: 0x16569ec0.posErrorMarker{id: 174} == 0 +
1*0x16569ec0.negError{id: 175} + 1*_UILayoutGuide:0x1655a6c0.Width{id:
176} 0x16570520.posErrorMarker{id: 171} == 0 +
1*0x16570520.negError{id: 172} + 1*_UILayoutGuide:0x165a3c70.Width{id:
173} UITransitionView:0x165a21d0.Height{id: 159} == 960 +
1*0x165f11b0.marker{id: 150} + 2*0x1655ed20.marker{id: 168}
UITransitionView:0x165a21d0.Width{id: 154} == 640 +
1*0x1655f650.marker{id: 164} UITransitionView:0x165a21d0.minX{id:
162} == 0 + 2*0x1658f790.marker{id: 161} + -0.5*0x1655f650.marker{id:
164} UITransitionView:0x165a21d0.minY{id: 163} == 0 +
2*0x1655f080.marker{id: 167} + -1*0x1655ed20.marker{id: 168}
UIView:0x1659fb60.Height{id: 185} == 960 + 1*0x165f11b0.marker{id:
150} + 2*0x1655ed20.marker{id: 168} + 2*0x16559660.marker{id: 194}
UIView:0x1659fb60.Width{id: 188} == 640 + 1*0x1655f650.marker{id:
164} + 2*0x1656b160.marker{id: 190} UIView:0x1659fb60.minX{id: 187}
== 0 + 2*0x165596b0.marker{id: 186} + -1*0x1656b160.marker{id: 190} UIView:0x1659fb60.minY{id: 189} == 0 + 2*0x1656b190.marker{id: 193} +
-1*0x16559660.marker{id: 194} UIWindow:0x165a6fe0.Height{id: 141} == 960 + 1*0x165f11b0.marker{id: 150} UIWindow:0x165a6fe0.Width{id: 136}
== 640 + 1*0x165ae3a0.marker{id: 147} UIWindow:0x165a6fe0.minX{id: 144} == 0 + 2*0x16588c90.marker{id: 143} + -0.5*0x165ae3a0.marker{id:
147} UIWindow:0x165a6fe0.minY{id: 146} == 0 + 2*0x165f4e20.marker{id:
145} + -0.5*0x165f11b0.marker{id: 150}
_UILayoutGuide:0x1655a6c0.Height{id: 182} == 0 +
1*0x1656c6a0.marker{id: 181} _UILayoutGuide:0x1655a6c0.minY{id: 184}
== 960 + 1*0x165f11b0.marker{id: 150} + 2*0x1655ed20.marker{id: 168} + -1*0x1656c6a0.marker{id: 181} + 1*0x1656b5f0.marker{id: 183} + 2*0x16559660.marker{id: 194} _UILayoutGuide:0x165a3c70.Height{id:
178} == 40 + 1*0x1656af20.marker{id: 177}
_UILayoutGuide:0x165a3c70.minY{id: 180} == 0 +
1*0x165676a0.marker{id: 179} objective{id: 1} == {objective
0x165f98c0: <> + <750:-6.61817e-08>*0x16569cd0.negError{id: 118} +
<999:2>*0x16569ec0.negError{id: 175} + <999:2>0x16570520.negError{id:
172} + <999:1>_UILayoutGuide:0x1655a6c0.Width{id: 176} +
<999:1>*_UILayoutGuide:0x165a3c70.Width{id: 173}}
Constraints: Marker:0x16559660.marker{id: 194}
Marker:0x165596b0.marker{id: 186}
(Integralization adjustment:3.20747e-06)
Marker:0x1655ed20.marker{id: 168}
Marker:0x1655f080.marker{id: 167}
Marker:0x1655f650.marker{id:
164} Marker:0x1656b160.marker{id: 190}
(Integralization adjustment:6.41495e-06)
Marker:0x1656b190.marker{id: 193}
Marker:0x1658f790.marker{id: 161}
Marker:0x165ae3a0.marker{id: 147}
Marker:0x165f11b0.marker{id: 150}
<_UILayoutSupportConstraint:0x165676a0
V:|-(0)-[_UILayoutGuide:0x165a3c70] (Names: '|':UIView:0x1659fb60
)> Marker:0x165676a0.marker{id: 179}
<_UILayoutSupportConstraint:0x16569ec0
H:[_UILayoutGuide:0x1655a6c0(0#999)]
priority:999> Marker:0x16569ec0.posErrorMarker{id: 174}
<_UILayoutSupportConstraint:0x1656af20
V:[_UILayoutGuide:0x165a3c70(20)]> Marker:0x1656af20.marker{id: 177}
<_UILayoutSupportConstraint:0x1656b5f0
_UILayoutGuide:0x1655a6c0.bottom == UIView:0x1659fb60.bottom> Marker:0x1656b5f0.marker{id: 183}
<_UILayoutSupportConstraint:0x1656c6a0
V:[_UILayoutGuide:0x1655a6c0(0)]> Marker:0x1656c6a0.marker{id: 181}
<_UILayoutSupportConstraint:0x16570520
H:[_UILayoutGuide:0x165a3c70(0#999)]
priority:999> Marker:0x16570520.posErrorMarker{id: 171}
<_UIWindowAnchoringConstraint:0x16588c90 h=--- v=---
UIWindow:0x165a6fe0.midX == + 160> Marker:0x16588c90.marker{id: 143}
<_UIWindowAnchoringConstraint:0x165f4e20 h=--- v=---
UIWindow:0x165a6fe0.midY == + 240> Marker:0x165f4e20.marker{id: 145}
Integralization Adjustments: 0x165596b0.marker{id: 186}
[] ->
0.000003 0x1656b160.marker{id: 190} [] ->
0.000006
Statistics: 18 rows. Variable counts:
1 -> 6
2 -> 10
3 -> 1
5 -> 1 }: internal error. Cannot find an outgoing row head for incoming head 0x16569cd0.negError{id: 118}, which should never
happen.'
*** First throw call stack: (0x2f3cef83 0x39b7fccf 0x2f3ceec5 0x2fd3a315 0x2fd39e57 0x2fd35b95 0x31beacd3 0x31e832ab 0x31be9bc1
0x31d02f4f 0x31c23d57 0x31c23c73 0x31870111 0x3a06781f 0x3a067777
0x2f3998a1 0x2f398175 0x2f302ebf 0x2f302ca3 0x34208663 0x31c4f14d
0x28f3f 0x3a08cab7) libc++abi.dylib: terminating with uncaught
exception of type NSException (lldb)
I already tried to:
disable size classes
reset all constraints on the other controller, present modally a blank view controller
obviously everything is working on iOS 8/9
Some advice?