QPixmap will crash when create

I created a project to convert png images, and got crash when loading png file to QPixmap.

It crashed in QOpenGLFunction.

but when i change QCoreApplication to QApplication, the crash disappeared!
 

backtrace is here:

. 0 Id: 1228.3d78 Suspend: 1 Teb: 00000048`379e7000 Unfrozen
Child-SP RetAddr Call Site
00000048`3770f8b0 00007ffd`f119d9c4 Qt5Guid!QOpenGLFunctions_3_1::glGetActiveUniformBlockiv+0x1b2a98
00000048`3770f8f0 00007ffd`f119b3cb Qt5Guid!QOpenGLFunctions_3_1::glGetActiveUniformBlockiv+0x1a959c
00000048`3770fa10 00007ff6`fb171bf1 Qt5Guid!QOpenGLFunctions_3_1::glGetActiveUniformBlockiv+0x1a6fa3
00000048`3770fa40 00007ff6`fb175ebd convertpngiccp!main(int argc = 0n2, char ** argv = 0x000001b3`b311d210)+0x1d1 [c:\work\convertpngiccp\main.cpp @ 27]
00000048`3770fb90 00007ff6`fb173a6d convertpngiccp!WinMain(struct HINSTANCE__ * __formal = 0x00007ff6`fb170000)+0xed [c:\users\qt\work\qt\qtbase\src\winmain\qtmain_win.cpp @ 104]
00000048`3770fc10 00007ff6`fb173917 convertpngiccp!invoke_main(void)+0x2d [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl @ 99]
00000048`3770fc50 00007ff6`fb1737de convertpngiccp!__scrt_common_main_seh(void)+0x127 [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl @ 253]
00000048`3770fcb0 00007ff6`fb173a89 convertpngiccp!__scrt_common_main(void)+0xe [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl @ 296]
00000048`3770fce0 00007ffe`2abf8364 convertpngiccp!WinMainCRTStartup(void)+0x9 [f:\dd\vctools\crt\vcstartup\src\startup\exe_winmain.cpp @ 17]
00000048`3770fd10 00007ffe`2d1f7091 KERNEL32!BaseThreadInitThunk+0x14
00000048`3770fd40 00000000`00000000 ntdll!RtlUserThreadStart+0x21

1 Id: 1228.978 Suspend: 1 Teb: 00000048`379e9000 Unfrozen
Child-SP RetAddr Call Site
00000048`37aff968 00007ffe`2d1c354e ntdll!ZwWaitForWorkViaWorkerFactory+0x14
00000048`37aff970 00007ffe`2abf8364 ntdll!RtlReleaseSRWLockExclusive+0x1ade
00000048`37affd70 00007ffe`2d1f7091 KERNEL32!BaseThreadInitThunk+0x14
00000048`37affda0 00000000`00000000 ntdll!RtlUserThreadStart+0x21

2 Id: 1228.4a34 Suspend: 1 Teb: 00000048`379eb000 Unfrozen
Child-SP RetAddr Call Site
00000048`37bffa68 00007ffe`2d1c354e ntdll!ZwWaitForWorkViaWorkerFactory+0x14
00000048`37bffa70 00007ffe`2abf8364 ntdll!RtlReleaseSRWLockExclusive+0x1ade
00000048`37bffe70 00007ffe`2d1f7091 KERNEL32!BaseThreadInitThunk+0x14
00000048`37bffea0 00000000`00000000 ntdll!RtlUserThreadStart+0x21

3 Id: 1228.510c Suspend: 1 Teb: 00000048`379ed000 Unfrozen
Child-SP RetAddr Call Site
00000048`37cffaf8 00007ffe`2d1c354e ntdll!ZwWaitForWorkViaWorkerFactory+0x14
00000048`37cffb00 00007ffe`2abf8364 ntdll!RtlReleaseSRWLockExclusive+0x1ade
00000048`37cfff00 00007ffe`2d1f7091 KERNEL32!BaseThreadInitThunk+0x14
00000048`37cfff30 00000000`00000000 ntdll!RtlUserThreadStart+0x21