Storyboard compiler error when building for iOS 7

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Created Jul ’15

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We have a Swift project for an UIKit app that is using Storyboards. Everything was fine until I decided to lower the Minimum deployment target of the app to iOS 7. When building the app I hit an assert in the ibtool which is trying to compile the storyboard. The error goes like this:

2015-07-13 18:24:36.356 ibtoold[6894:1759694] [MT] DVTAssertions: ASSERTION FAILURE in /SourceCache/IDEInterfaceBuilder/IDEInterfaceBuilder-7706/InterfaceBuilderKit/Connections/IBConnection.m:182
Details:  Source and destination must be unique
Object:   <IBCocoaTouchStoryboardPushSegue: 0x7ff9a2a0d2f0>
Method:   -setDestination:
Thread:   <NSThread: 0x7ff99b5416d0>{number = 1, name = main}
Hints: None
Backtrace:
  0  0x000000010b398b87 -[DVTAssertionHandler handleFailureInMethod:object:fileName:lineNumber:assertionSignature:messageFormat:arguments:] (in DVTFoundation)
  1  0x000000010b3985df _DVTAssertionHandler (in DVTFoundation)
  2  0x000000010b3988ce _DVTAssertionFailureHandler (in DVTFoundation)
  3  0x000000010c1be2b2 -[IBConnection setDestination:] (in IDEInterfaceBuilderKit)
  4  0x000000010c1bd409 +[IBConnection connectionWithSource:label:andDestination:] (in IDEInterfaceBuilderKit)
  5  0x0000000112514798 (in IDEInterfaceBuilderCocoaTouchIntegration)
  6  0x000000011256eabb (in IDEInterfaceBuilderCocoaTouchIntegration)
  7  0x000000010c2402b2 -[IBDocument updateConnectionsAfterEnablingOrDisablingConfigurations] (in IDEInterfaceBuilderKit)
  8  0x000000010c240fd4 __35-[IBDocument disableConfigurations]_block_invoke (in IDEInterfaceBuilderKit)
  9  0x000000010c240a2b -[IBDocument maintainCanvasCentersWhileTransformingCanvasPositions:] (in IDEInterfaceBuilderKit)
10  0x000000010c240edc -[IBDocument disableConfigurations] (in IDEInterfaceBuilderKit)
11  0x00000001124f252c (in IDEInterfaceBuilderCocoaTouchIntegration)
12  0x000000010c2562a9 -[IBDocumentAutolayoutManager runBlockInNewArbitrationStackEntryWithBehavior:block:] (in IDEInterfaceBuilderKit)
13  0x000000010c23cc6b -[IBDocument modifyViewsInAutolayoutSafeWayDuring:] (in IDEInterfaceBuilderKit)
14  0x00000001124f24e2 (in IDEInterfaceBuilderCocoaTouchIntegration)
15  0x00000001124c71e5 (in IDEInterfaceBuilderCocoaTouchIntegration)
16  0x000000010c2050cf -[IBDocument finishChangingTargetRuntimeInCompiledIntermediateDocument] (in IDEInterfaceBuilderKit)
17  0x000000010c264651 __85-[IBDocumentCompiler invokeWithIntermediateDocumentOfTargetRuntime:alwaysCopy:block:]_block_invoke (in IDEInterfaceBuilderKit)
18  0x000000010c2643e9 -[IBDocumentCompiler invokeWithIntermediateDocument:] (in IDEInterfaceBuilderKit)
19  0x000000010c26458d -[IBDocumentCompiler invokeWithIntermediateDocumentOfTargetRuntime:alwaysCopy:block:] (in IDEInterfaceBuilderKit)
20  0x000000010c4695ac -[IBStoryboardDocumentCompiler compileWithOptions:error:] (in IDEInterfaceBuilderKit)
21  0x000000010c264777 +[IBDocumentCompiler compileContentsOfDocument:options:error:] (in IDEInterfaceBuilderKit)
22  0x000000010c21f390 __47-[IBDocument compiledPackageWithOptions:error:]_block_invoke (in IDEInterfaceBuilderKit)
23  0x000000010c257d25 -[IBDocumentAutolayoutManager assertIfArbitrationIsScheduledDuring:] (in IDEInterfaceBuilderKit)
24  0x000000010c21f2e7 -[IBDocument compiledPackageWithOptions:error:] (in IDEInterfaceBuilderKit)
25  0x000000010b1a1f0a (in ibtoold)
26  0x000000010b19eb64 (in ibtoold)
27  0x000000010b1a1370 (in ibtoold)
28  0x000000010b1a7233 (in ibtoold)
29  0x000000010b1a77b0 (in ibtoold)
30  0x000000010b1a7683 (in ibtoold)
31  0x000000010b19666a (in ibtoold)
32  0x000000010b1a6e2c (in ibtoold)
33  0x000000010b1a6074 (in ibtoold)
34  0x00007fff9611a5c9 start (in libdyld.dylib)
35  0x0000000000000002
Command /Applications/Xcode.app/Contents/Developer/usr/bin/ibtool failed with exit code 255

I checked all segues (and they are a lot) but I din't seem to see something wrong. Also when the Minimum deployment target is 8.x there is not a problem.

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