The plugin stopped working, throwing exceptions

[AlexiyOrlov]

I have separated lexer and parser rules, Everything worked fine until today. Whenever I try to test a parser rule, it's throwing exceptions which I can see from blinking error icon of Idea. Here are exceptions:
1.

java.lang.StackOverflowError
	at org.antlr.v4.runtime.misc.MurmurHash.update(MurmurHash.java:71)
	at org.antlr.v4.runtime.atn.LexerATNConfig.hashCode(LexerATNConfig.java:78)
	at org.antlr.v4.runtime.misc.ObjectEqualityComparator.hashCode(ObjectEqualityComparator.java:29)
	at org.antlr.v4.runtime.misc.Array2DHashSet.getBucket(Array2DHashSet.java:108)
	at org.antlr.v4.runtime.misc.Array2DHashSet.getOrAddImpl(Array2DHashSet.java:63)
	at org.antlr.v4.runtime.misc.Array2DHashSet.getOrAdd(Array2DHashSet.java:59)
	at org.antlr.v4.runtime.atn.ATNConfigSet.add(ATNConfigSet.java:146)
	at org.antlr.v4.runtime.atn.ATNConfigSet.add(ATNConfigSet.java:122)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:449)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)

java.lang.StackOverflowError
	at org.antlr.v4.runtime.atn.ATNConfigSet.add(ATNConfigSet.java:122)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:449)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)

java.lang.StackOverflowError
	at org.antlr.v4.runtime.misc.Array2DHashSet.getBucket(Array2DHashSet.java:108)
	at org.antlr.v4.runtime.misc.Array2DHashSet.getOrAddImpl(Array2DHashSet.java:63)
	at org.antlr.v4.runtime.misc.Array2DHashSet.getOrAdd(Array2DHashSet.java:59)
	at org.antlr.v4.runtime.atn.ATNConfigSet.add(ATNConfigSet.java:146)
	at org.antlr.v4.runtime.atn.ATNConfigSet.add(ATNConfigSet.java:122)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:449)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)

java.lang.StackOverflowError
	at org.antlr.v4.runtime.misc.Array2DHashSet.getOrAdd(Array2DHashSet.java:59)
	at org.antlr.v4.runtime.atn.ATNConfigSet.add(ATNConfigSet.java:146)
	at org.antlr.v4.runtime.atn.ATNConfigSet.add(ATNConfigSet.java:122)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:449)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)
	at org.antlr.v4.runtime.atn.LexerATNSimulator.closure(LexerATNSimulator.java:458)

"Invalidate and restart" doesn't help.

[bjansen]

It's not the exact same stack trace as #354 but it seems to involve a lot of LexerATNSimulator.java:458 as well.
I think your errors are not caused by the plugin itself, but by the ANTLR tool, see antlr/antlr4#1943 and antlr/antlr4#1105.

[bjansen]

Please refer to the aforementioned issues to track progress on fixes.