Unity 5.2 Crash on focus

I've updated Unity to 5.2. When opening my project (from 5.1.3p0) it crashes. Seems to be crashing if I select another app and then focus back to Unity. Also when press Play or build it crashes.

Don't know if its Unity or the NGUI plugin that creates the issue. I've also opened another project (with NGUI) that works fine.

Log file (11mb)

Last lines

 (Filename: Assets/NGUI/Scripts/Internal/NGUIText.cs Line: 130)
 
 NullReferenceException: Object reference not set to an instance of an object
   at NGUIText.Update (Boolean request) [0x000f6] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/Internal/NGUIText.cs:130 
   at NGUIText.Update () [0x00000] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/Internal/NGUIText.cs:92 
   at UILabel.UpdateNGUIText () [0x00315] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/UI/UILabel.cs:2046 
   at UILabel.ProcessText (Boolean legacyMode, Boolean full) [0x001c5] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/UI/UILabel.cs:1237 
   at UILabel.ProcessText () [0x00000] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/UI/UILabel.cs:1197 
   at UILabel.get_processedText () [0x0004c] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/UI/UILabel.cs:845 
   at UILabel.OnFill (.BetterList`1 verts, .BetterList`1 uvs, .BetterList`1 cols) [0x000a6] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/UI/UILabel.cs:1742 
   at UIWidget.UpdateGeometry (Int32 frame) [0x00081] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/Internal/UIWidget.cs:1461 
   at UIPanel.UpdateWidgets () [0x0023c] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/UI/UIPanel.cs:1596 
   at UIPanel.UpdateSelf () [0x0000c] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/UI/UIPanel.cs:1237 
   at UIPanel.LateUpdate () [0x00035] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/UI/UIPanel.cs:1198 
   at UIPanel.Refresh () [0x0001d] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/UI/UIPanel.cs:1711 
   at UILabel.OnFontChanged (UnityEngine.Font font) [0x000ce] in /Volumes/Work/Unity/xRockets/Assets/NGUI/Scripts/UI/UILabel.cs:1001 
   at UnityEngine.Font.InvokeTextureRebuilt_Internal (UnityEngine.Font font) [0x00000] in <filename unknown>:0 
  
 (Filename: Assets/NGUI/Scripts/Internal/NGUIText.cs Line: 130)
 
 Receiving unhandled NULL exception
 Launching bug reporter
 Obtained 18 stack frames.
 #0  0x00000000000100 in (Unknown)
 #1  0x0000010141d1a7 in AssetInterface::WriteRevertAssets(std::set<UnityGUID, std::less<UnityGUID>, std::allocator<UnityGUID> > const&, std::set<UnityGUID, std::less<UnityGUID>, std::allocator<UnityGUID> > const&)
 #2  0x000001019a28df in Application::SaveScene(std::string, bool)
 #3  0x000001019a2dcb in Application::FileMenuSave(bool)
 #4  0x007fff95a31cd7 in _os_activity_initiate
 #5  0x007fff8984feb1 in -[NSApplication sendAction:to:from:]
 #6  0x007fff8984fc4e in -[NSMenuItem _corePerformAction]
 #7  0x007fff8984f97c in -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:]
 #8  0x007fff95a31cd7 in _os_activity_initiate
 #9  0x007fff8984e8ad in -[NSMenu performKeyEquivalent:]
 #10 0x007fff8984da6f in -[NSApplication _handleKeyEquivalent:]
 #11 0x007fff8975883a in -[NSApplication sendEvent:]
 #12 0x00000101be75b1 in -[EditorApplicationPrincipalClass sendEvent:]
 #13 0x007fff89681b68 in -[NSApplication run]
 #14 0x007fff895fe244 in NSApplicationMain
 #15 0x00000101be7c96 in EditorMain(int, char const**)
 #16 0x00000101be84e9 in main
 #17 0x00000100002264 in start
 Launching external process: /Applications/Unity 5.2/Unity.app/Contents/BugReporter/Unity Bug Reporter.app/Contents/MacOS/unity.bugreporter.exe