Crash on export

Hello,
I use the app (1.3.0 (267) from AppStore) to convert 1 .svg file to multiple size .png files
But when I open the app, open my svg file :
first export with custom size (for example 150%) -> OK
second export with another size (for example 200%)
-> it crashes
sometimes the second export succeed, but it crashed on the third one, etc.
I join the backtrace of the crashed thread
I have also submitted the crash reports to apple, so you should get them through Xcode
Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000018
Exception Note:        EXC_CORPSE_NOTIFY

VM Regions Near 0x18:
--> 
    __TEXT                 0000000103b66000-0000000103baa000 [  272K] r-x/rwx SM=COW  /Applications/Gapplin.app/Contents/MacOS/Gapplin

Application Specific Information:
objc_msgSend() selector name: invalid
Performing @selector(saveDocumentTo:) from sender NSMenuItem 0x7fa3f2719860

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib                 0x00007fff8c82f4dd objc_msgSend + 29
1   com.apple.AppKit                0x00007fff87f1c6d6 -[NSView _setSuperview:] + 2602
2   com.apple.AppKit                0x00007fff87f1b814 -[NSView addSubview:] + 448
3   com.apple.AppKit                0x00007fff87f83604 -[NSWindow setContentView:] + 638
4   com.apple.ViewBridge            0x00007fff94bb5183 setWindowContentView + 75
5   com.apple.ViewBridge            0x00007fff94b99cbd -[NSRemoteViewBase setAccessoryView:] + 208
6   com.apple.AppKit                0x00007fff88788f04 -[NSVBSavePanel(NSSavePanelSPI) _sendAccessoryView:] + 49
7   com.wolfrosch.Gapplin           0x0000000103b833ad 0x103b66000 + 119725
8   com.wolfrosch.Gapplin           0x0000000103b7cb68 0x103b66000 + 93032
9   com.apple.AppKit                0x00007fff88328ec1 __85-[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_invoke_2 + 627
10  com.apple.AppKit                0x00007fff882d0712 -[NSDocument _commitEditingThenContinue:] + 495
11  com.apple.AppKit                0x00007fff882d0514 -[NSDocument _commitEditingWithDelegate:didSomethingSelector:contextInfo:thenContinue:] + 138
12  com.apple.AppKit                0x00007fff88328c3f __85-[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_invoke + 369
13  com.apple.AppKit                0x00007fff884549a2 -[NSDocument _performActivity:] + 1736
14  com.apple.AppKit                0x00007fff8819484f -[NSDocument performActivityWithSynchronousWaiting:usingBlock:cancellationHandler:] + 457
15  com.apple.AppKit                0x00007fff88328abf -[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:] + 137
16  com.wolfrosch.Gapplin           0x0000000103b7cadc 0x103b66000 + 92892
17  libsystem_trace.dylib           0x00007fff94a7c07a _os_activity_initiate + 75
18  com.apple.AppKit                0x00007fff881a7dbd -[NSApplication sendAction:to:from:] + 460
19  com.apple.AppKit                0x00007fff881a7b57 -[NSMenuItem _corePerformAction] + 336
20  com.apple.AppKit                0x00007fff881a78b7 -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 114
21  libsystem_trace.dylib           0x00007fff94a7c07a _os_activity_initiate + 75
22  com.apple.AppKit                0x00007fff88239e54 -[NSMenu performActionForItemAtIndex:] + 131
23  com.apple.AppKit                0x00007fff88239dc7 -[NSMenu _internalPerformActionForItemAtIndex:] + 35
24  com.apple.AppKit                0x00007fff88239c1f -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 107
25  com.apple.AppKit                0x00007fff880defd9 NSSLMMenuEventHandler + 708
26  com.apple.HIToolbox             0x00007fff8791e7be DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 1231
27  com.apple.HIToolbox             0x00007fff8791dc48 SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 404
28  com.apple.HIToolbox             0x00007fff879339e6 SendEventToEventTarget + 40
29  com.apple.HIToolbox             0x00007fff8797d99a SendHICommandEvent(unsigned int, HICommand const*, unsigned int, unsigned int, unsigned char, void const*, OpaqueEventTargetRef*, OpaqueEventTargetRef*, OpaqueEventRef**) + 411
30  com.apple.HIToolbox             0x00007fff879a8d5b SendMenuCommandWithContextAndModifiers + 59
31  com.apple.HIToolbox             0x00007fff879a8d0c SendMenuItemSelectedEvent + 188
32  com.apple.HIToolbox             0x00007fff879a8be8 FinishMenuSelection(SelectionData*, MenuResult*, MenuResult*) + 96
33  com.apple.HIToolbox             0x00007fff879a9596 MenuSelectCore(MenuData*, Point, double, unsigned int, OpaqueMenuRef**, unsigned short*) + 711
34  com.apple.HIToolbox             0x00007fff879a9230 _HandleMenuSelection2 + 460
35  com.apple.AppKit                0x00007fff880ca0fa _NSHandleCarbonMenuEvent + 277
36  com.apple.AppKit                0x00007fff87f3f13d _DPSNextEvent + 1906
37  com.apple.AppKit                0x00007fff87f3e226 -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 454
38  com.apple.AppKit                0x00007fff87f32d80 -[NSApplication run] + 682
39  com.apple.AppKit                0x00007fff87efc368 NSApplicationMain + 1176
40  com.wolfrosch.Gapplin           0x0000000103b67f89 0x103b66000 + 8073
41  libdyld.dylib                   0x00007fff929c35ad start + 1
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