Multimc5: Allocated RAM error

[MrVideo]

System Information

MultiMC version:
0.4.11-751
Operating System:
Windows 10 64 bit

Summary of the issue or suggestion:

Minecraft doesn't start telling me "Invalid maximum heap size: -Xmx4096m
The specified size exceeds the maximum representable size." even though my computer has 16 GB of RAM installed.

What should happen:

Minecraft should be launched.

Steps to reproduce the issue (Add more if needed):

1. Create an instance, go to options and on "Maximum memory allocation" insert the value 4096
2. Launch the instance
   

   Suspected cause:

I have no clue, on my Mac it used to work every time.

Logs/Screenshots:

Log per GitHub.txt

Additional Info:

[Heufneutje]

You probably have 32-bit Java installed. Try installing 64-bit Java and re-running the Java detector in MultiMC.

[peterix]

No response in a long time... closing.