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Created file startup.py:

from qgis.core import *
QgsApplication.setPrefixPath('/Applications/QGIS3.app/Contents/MacOS', True)
qgs = QgsApplication([], False)
qgs.initQgis()
qgs.exitQgis()

and saved in "Library/Application Support/QGIS/QGIS3" (The example taken from PyQGIS Cookbook).

Trying to start QGIS 3.4 under macOS Catalina I get a message in separate window "No Data Providers:

No QGIS data provider plugins found in:

No vector layers can be loaded. Check your QGIS installation.

After I close this window QGIS crashes. If I delete startup.py QGIS starts it's right way.

What is the reason of that error?

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