Unexpected exception while parsing file - (Python)

What does this error mean?

command:

sourceanalyzer -verbose -b ${buildID} -python-version 3 -python-path /usr/lib/python3.7:/usr/local/lib/python3.7/site-packages /dir/**/*.py

error log:

[error]: Unexpected exception while parsing file Notebook.py
java.lang.NullPointerException: null
	at com.fortify.frontend.translator.nodes.STExpressionList.addChild(STExpressionList.java:60) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.frontend.translator.python3.Python3Translator.visitTestlist_star_expr(Python3Translator.java:3584) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.frontend.translator.python3.Python3Translator.buildAssignment(Python3Translator.java:3207) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.frontend.translator.python3.Python3Translator.visitExpr_stmt(Python3Translator.java:2986) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.frontend.translator.python3.Python3Translator.visitSmall_stmt(Python3Translator.java:5274) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.frontend.translator.python3.Python3Translator.visitSimple_stmt(Python3Translator.java:5222) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.frontend.translator.python3.Python3Translator.visitStmt(Python3Translator.java:5210) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.frontend.translator.python3.Python3Translator.visitStmt(Python3Translator.java:51) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.frontend.parser.python3.Python3Parser$StmtContext.accept(Python3Parser.java:2099) ~[sca-frontend-19.2.0.0196.jar:?]
	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visitChildren(AbstractParseTreeVisitor.java:46) ~[antlr4-runtime-4.7.jar:4.7]
	at com.fortify.frontend.translator.python3.Python3Translator.visitFile_input(Python3Translator.java:2385) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.frontend.translator.python3.Python3Translator.visitFile_input(Python3Translator.java:51) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.frontend.parser.python3.Python3Parser$File_inputContext.accept(Python3Parser.java:491) ~[sca-frontend-19.2.0.0196.jar:?]
	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18) ~[antlr4-runtime-4.7.jar:4.7]
	at com.fortify.frontend.parser.python3.Python3ParserWrapper.translate(Python3ParserWrapper.java:65) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.frontend.parser.python3.Python3ParserWrapper.parse(Python3ParserWrapper.java:101) ~[sca-frontend-19.2.0.0196.jar:?]
	at com.fortify.sca.frontend.Python3FrontEnd.runParseTranslateResolvePython(Python3FrontEnd.java:280) [fortify-sca-19.2.0.0196.jar:?]
	at com.fortify.sca.frontend.Python3FrontEnd.runTranslator(Python3FrontEnd.java:209) [fortify-sca-19.2.0.0196.jar:?]
	at com.fortify.sca.frontend.FrontEndSession.runSingleFrontEnd(FrontEndSession.java:229) [fortify-sca-19.2.0.0196.jar:?]
	at com.fortify.sca.frontend.FrontEndSession.runFrontEnd(FrontEndSession.java:188) [fortify-sca-19.2.0.0196.jar:?]
	at com.fortify.sca.Main$Sourceanalyzer.run(Main.java:533) [fortify-sca-19.2.0.0196.jar:?]

I'm ussing SCA v19.2

I have a similar issue in matplotlib/scale.py using version 21.2.3

D:\Apps\fortify\Fortify_SCA_and_Apps_21.2.3\bin>sourceanalyzer -b nexus -python-version 3 -python-path d:\apps\python38_64;d:\apps\python38_64;d:\Apps\python38_64\Lib\site-packages;d:\nexus\dev20\python\package d:\nexus\dev20\python\**\*.py
[error]: Unexpected exception while parsing file d:/Apps/python38_64/Lib/site-packages/matplotlib/scale.py
java.lang.StringIndexOutOfBoundsException: begin 0, end -1, length 1
at java.lang.String.checkBoundsBeginEnd(String.java:3319) ~[?:?]
at java.lang.String.substring(String.java:1874) ~[?:?]

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