Hello, when I add drone in depot crash occured.

The error message is the following:

Factorio crashed. Generating symbolized stacktrace, please wait ...
c:\cygwin64\tmp\factorio-build-9ts10c\src\ai\pathfindalgorithm.cpp (1147): PathFindAlgorithm::baseDistanceHeuristic
c:\cygwin64\tmp\factorio-build-9ts10c\src\ai\pathfindalgorithm.cpp (1042): PathFindAlgorithm::expandBaseNode
c:\cygwin64\tmp\factorio-build-9ts10c\src\ai\pathfindalgorithm.cpp (618): PathFindAlgorithm::baseSearch
c:\cygwin64\tmp\factorio-build-9ts10c\src\ai\pathfindalgorithm.cpp (466): PathFindAlgorithm::update
c:\cygwin64\tmp\factorio-build-9ts10c\src\ai\pathfinder.cpp (399): PathFinder::update
c:\cygwin64\tmp\factorio-build-9ts10c\src\surface\surface.cpp (1565): Surface::update
c:\cygwin64\tmp\factorio-build-9ts10c\src\map\map.cpp (1698): Map::updateEntities
c:\cygwin64\tmp\factorio-build-9ts10c\src\game.cpp (201): Game::update
c:\cygwin64\tmp\factorio-build-9ts10c\src\scenario\scenario.cpp (1219): Scenario::update
c:\cygwin64\tmp\factorio-build-9ts10c\src\mainloop.cpp (1170): MainLoop::gameUpdateStep
c:\cygwin64\tmp\factorio-build-9ts10c\src\mainloop.cpp (1037): MainLoop::gameUpdateLoop
c:\cygwin64\tmp\factorio-build-9ts10c\src\util\workerthread.cpp (49): WorkerThread::loop
c:\program files (x86)\microsoft visual studio\2017\buildtools\vc\tools\msvc\14.15.26726\include\thr\xthread (230): std::_LaunchPad<std::unique_ptr<std::tuple<void (__cdecl TransferSource::)(void),TransferSource >,std::default_delete<std::tuple<void (__cdecl TransferSource::)(void),TransferSource > > > >::_Go
c:\program files (x86)\microsoft visual studio\2017\buildtools\vc\tools\msvc\14.15.26726\include\thr\xthread (209): std::_Pad::_Call_func
minkernel\crts\ucrt\src\appcrt\startup\thread.cpp (115): thread_start<unsigned int (__cdecl*)(void * __ptr64)>
ERROR: SymGetLineFromAddr64, GetLastError: 487 (Address: 00000000776559CD)
00000000776559CD (kernel32): (filename not available): BaseThreadInitThunk
ERROR: SymGetLineFromAddr64, GetLastError: 487 (Address: 000000007778A561)
000000007778A561 (ntdll): (filename not available): RtlUserThreadStart
Stack trace logging done
246.892 Error PathFindAlgorithm.cpp:1147: abstractNodeIt != search.abstractNodes.end() was not true
Logger::writeStacktrace skipped.
246.892 Error CrashHandler.cpp:190: Map tick at moment of crash: 846000
246.892 Error Util.cpp:97: Unexpected error occurred. If you're running the latest version of the game you can help us solve the problem by posting the contents of the log file on the Factorio forums.

I was just building more road and got a similar crash.

Factorio crashed. Generating symbolized stacktrace, please wait ...
c:\cygwin64\tmp\factorio-build-tqzfrb\src\ai\pathfindalgorithm.cpp (1147): PathFindAlgorithm::baseDistanceHeuristic
c:\cygwin64\tmp\factorio-build-tqzfrb\src\ai\pathfindalgorithm.cpp (1042): PathFindAlgorithm::expandBaseNode
c:\cygwin64\tmp\factorio-build-tqzfrb\src\ai\pathfindalgorithm.cpp (618): PathFindAlgorithm::baseSearch
c:\cygwin64\tmp\factorio-build-tqzfrb\src\ai\pathfindalgorithm.cpp (466): PathFindAlgorithm::update
c:\cygwin64\tmp\factorio-build-tqzfrb\src\ai\pathfinder.cpp (399): PathFinder::update
c:\cygwin64\tmp\factorio-build-tqzfrb\src\surface\surface.cpp (1565): Surface::update
c:\cygwin64\tmp\factorio-build-tqzfrb\src\map\map.cpp (1698): Map::updateEntities
c:\cygwin64\tmp\factorio-build-tqzfrb\src\game.cpp (201): Game::update
c:\cygwin64\tmp\factorio-build-tqzfrb\src\scenario\scenario.cpp (1219): Scenario::update
c:\cygwin64\tmp\factorio-build-tqzfrb\src\mainloop.cpp (1170): MainLoop::gameUpdateStep
c:\cygwin64\tmp\factorio-build-tqzfrb\src\mainloop.cpp (1037): MainLoop::gameUpdateLoop
c:\cygwin64\tmp\factorio-build-tqzfrb\src\util\workerthread.cpp (49): WorkerThread::loop
c:\program files (x86)\microsoft visual studio\2017\buildtools\vc\tools\msvc\14.15.26726\include\thr\xthread (230): std::_LaunchPad<std::unique_ptr<std::tuple<void (__cdecl RouterBase::)(void),ClientRouter >,std::default_delete<std::tuple<void (__cdecl RouterBase::)(void),ClientRouter > > > >::_Go
c:\program files (x86)\microsoft visual studio\2017\buildtools\vc\tools\msvc\14.15.26726\include\thr\xthread (209): std::_Pad::_Call_func
minkernel\crts\ucrt\src\appcrt\startup\thread.cpp (115): thread_start<unsigned int (__cdecl*)(void * __ptr64)>
ERROR: SymGetLineFromAddr64, GetLastError: 487 (Address: 00007FFF1E0C7BD4)
00007FFF1E0C7BD4 (KERNEL32): (filename not available): BaseThreadInitThunk
ERROR: SymGetLineFromAddr64, GetLastError: 487 (Address: 00007FFF1F6ECE51)
00007FFF1F6ECE51 (ntdll): (filename not available): RtlUserThreadStart
Stack trace logging done
123.834 Error PathFindAlgorithm.cpp:1147: abstractNodeIt != search.abstractNodes.end() was not true
Logger::writeStacktrace skipped.
123.834 Error CrashHandler.cpp:190: Map tick at moment of crash: 4900181
123.834 Error Util.cpp:97: Unexpected error occurred. If you're running the latest version of the game you can help us solve the problem by posting the contents of the log file on the Factorio forums.
Please also include the save file(s), any mods you may be using, and any steps you know of to reproduce the crash.

I can provide a save file if it would help, when I try to add a new section of road it reliably crashes. I have a pretty long road network, is there a length limit?