CudaText: Access Violation when closing files, on self-compiled Qt5 version

This problem occurs with 1.141.0 onwards.

When I close a file tab, I get this error popup:

Access violation.

Press OK to ignore and risk data corruption.
Press Abort to kill the program.

Also, if I try to install a plugin, I get this error in the console, and the plugin doesn’t install:

ERROR: Exception in CudaText for do_install_addon: Access violation