Error "Cannot read field "sym" because "this.lvar[od]" is null" when compiling

ADDITIONAL SYSTEM INFORMATION :
OS: Ubuntu 20.04 Desktop, Manjaro 20.2 Desktop
JDK: OpenJDK, Tumurin, Corretto


A DESCRIPTION OF THE PROBLEM :
Upgrading my project to java 17. Receiving an error message when compiling. Reverting to java 16 fixes it.

REGRESSION : Last worked in version 16.0.2

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile https://github.com/ProjectEdenGG/Nexus branch "feature/java-17"

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Program compiles
ACTUAL -
[ERROR] java.lang.NullPointerException: Cannot read field "sym" because "this.lvar[od]" is null
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Code.emitop1w(Code.java:956)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Items$LocalItem.load(Items.java:401)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.genArgs(Gen.java:902)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitNewClass(Gen.java:1961)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1852)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:877)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitReturn(Gen.java:1837)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1709)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:610)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:645)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:631)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStats(Gen.java:682)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1097)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1091)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:610)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:645)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.genMethod(Gen.java:967)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitMethodDef(Gen.java:930)
[ERROR] at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:921)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:610)
[ERROR] at jdk.compiler/com.sun.tools.javac.jvm.Gen.genClass(Gen.java:2414)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:737)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1617)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1585)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:946)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:317)
[ERROR] at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:176)
[ERROR] at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:64)
[ERROR] at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:50)


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https://github.com/ProjectEdenGG/Nexus

The code base is so massive (130,000+ source lines), I wasnt able to pinpoint exactly what is causing the issue.
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FREQUENCY : always