与 #59 有关。

现在， B4X 会将用户数据存储在程序所在目录下。如果程序运行目录不可写，创建data/目录的操作将会失败(报错“无法为配置创建目录”)，进而在之后需要对data/目录进行操作时出错，使程序崩溃。在 macOS 上的崩溃报告为：

...

Exception Type: EXC_BAD_ACCESS (SIGSEGV)

Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000008

Exception Note: EXC_CORPSE_NOTIFY

Termination Signal: Segmentation fault: 11

Termination Reason: Namespace SIGNAL, Code 0xb

Terminating Process: exc handler [584]

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread

0 com.yourcompany.Beslyric-for-X0x00000001021f53d3 PageLyricList::OnCreateLrcListItem() + 83

1 org.qt-project.QtCore 0x00000001052d5b85 0x1050ad000 + 2263941

2 org.qt-project.QtWidgets 0x00000001044aecef 0x1043b5000 + 1023215

3 org.qt-project.QtWidgets 0x00000001044aeb89 0x1043b5000 + 1022857

4 org.qt-project.QtWidgets 0x00000001044afcbf QAbstractButton::mouseReleaseEvent(QMouseEvent*) + 271

...

在 Ubuntu 上的崩溃报告为：

$ gdb -q -nh Beslyric-for-X core

...

Program terminated with signal SIGSEGV, Segmentation fault.

#0 0x000000000043dd5a in QVector::isDetached (this=0x8)

at ../../Qt5.9.8/5.9.8/gcc_64/include/QtCore/qvector.h:108

108 inline bool isDetached() const { return !d->ref.isShared(); }

[Current thread is 1 (Thread 0x7f9313923b00 (LWP 2870))]

(gdb) bt

#0 0x000000000043dd5a in QVector::isDetached (this=0x8)

at ../../Qt5.9.8/5.9.8/gcc_64/include/QtCore/qvector.h:108

#1 0x000000000043dc6d in QVector::detach (this=0x8)

at ../../Qt5.9.8/5.9.8/gcc_64/include/QtCore/qvector.h:378

#2 0x0000000000470da2 in QVector::begin (this=0x8)

at ../../Qt5.9.8/5.9.8/gcc_64/include/QtCore/qvector.h:205

#3 0x000000000046e2a5 in PageLyricList::OnCreateLrcListItem (this=0x1d85d70)

at ../BesLyric-for-X/MiddleWidgets/PageLyricList.cpp:495

...

在 Windows 上的崩溃报告为(暂无标准格式)：

Exception thrown: read access violation.

Call stack:

0 Beslyric-for-X.exe!QVector::begin() Line 204

1 Beslyric-for-X.exe!PageLyricList::OnCreateLrcListItem() Line 495

2 Qt5Core.dll!6a554dff()

...

for(LyricListItem& item: pCurrentLyricList->items)

pCurrentLyricList为空指针。