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IntelliJ IDEA not starting: Initial heap size set to a larger value than the maximum heap size

IntelliJ IDEA didn't want to start this morning.
Got the following error when trying to start it from a shell:
Error occurred during initialization of VM
Initial heap size set to a larger value than the maximum heap size
What happened is that IntelliJ IDEA loaded the JVM Options from the new custom vmoptions file in the config directory. On Windows:
%APPDATA%\Roaming\JetBrains\IntelliJIdea2020.1\idea64.exe.vmoptions
On macOs:
~/Library/Application Support/JetBrains/IntelliJIdea2020.1/idea.vmoptions
This file was not updated properly when I updated IntellIJ IDEA. It contained:
-Xms4g
-Xmx2048m
Fixed the issue by editing this file:
-Xms4g
-Xmx4g
Source: https://intellij-support.jetbrains.com/hc/en-us/community/posts/360004701620-idea-vmoptions-not-used-by-default 
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