[The issue is reproducible on Mac, but not on Windows]

Steps to reproduce the issue:
1. Download and open attached project.
2. Open scene named "MainGame".
2. Enter the Play mode.

Actual result:
The Editor crashes.

Expected result:
The Editor should not crash.

Reproduced with:
5.3.5f1, 5.3.6f1, 5.3.6p1, 5.4.0b25, 5.4.0f3.

Cannot reproduce with:
5.1.5f1, 5.2.5f1 (because of Scripting API update).
5.5.0a5 (strange behaviour: after updating the Scripting API and successfully clearing the "Console", the "Console" window does not output any error message, yet when trying to enter the Play mode the Editor informs that "All compiler errors have to be fixed before you can enter playmode!". It means that the functionality of "Clear" button is broken.)

Note1:
The user is trying to read bits from a binary file of 129,000 bytes to construct about 30,000 objects.

Note2:
Open script named "LevelLoader" and temporary delete the 21th line of code: "reader.Parse();" Notice that the crash does not occur anymore.