Driver throws exception when writing response

[smola]

on token \"<\", delete this token\nSyntax error on token \"<\", delete this token\nSyntax error on token(s), misplaced construct(s)\nSyntax error on tokens, delete these tokens\nSyntax error on token \"/\", delete this token\nSyntax error on token \"<\", @ expected\nSyntax error on token \"=\", ( expected\nSyntax error on tokens, Expression expected instead\nSyntax error on token \"/\", delete this token\nSyntax error on token \"<\", invalid Expression\nSyntax error on token \"<\", invalid Expression\nSyntax error on token \"<\", delete this token\nSyntax error on token \"<\", delete this token\nSyntax error on token(s), misplaced construct(s)\nSyntax error on tokens, delete these tokens\nSyntax error on token \"/\", delete this token\nSyntax error on token \"<\", @ expected\nSyntax error on token \"=\", <= expected\nSyntax error on token \"/\", delete this token\nSyntax error on token \"<\", invalid Expression\nSyntax error on token \"<\", invalid Expression\nSyntax error on token \"<\", invalid Expression\nSyntax error on token \"<\", invalid Expression\nSyntax error on token \"<\", delete this token\nSyntax error on token(s), misplaced construct(s)\nSyntax error on token(s), misplaced construct(s)\nSyntax error on tokens, delete these tokens\nSyntax error on token \"/\", delete this token\nSyntax error on token \"<\", @ expected\nSyntax error on token \"=\", <= expected\nSyntax error on token \"/\", delete this token\nSyntax error on token \"<\", invalid Expression\nSyntax error on token \"<\", delete this token\nSyntax error on token \"<\", delete this token\nSyntax error on token \"<\", delete this token\nSyntax error on token(s), misplaced construct(s)\nSyntax error on tokens, delete these tokens\nSyntax error on token \"/\", delete this token\nSyntax error on token \"<\", @ expected\nSyntax error on token \"=\", <= expected\nSyntax error on token \"/\", delete this token\nSyntax error on token \"<\", invalid Expression\nSyntax error on token \"<\", invalid Expression\nSyntax error on token \"<\", delete this token\nSyntax error on token \"<\", delete this token\nSyntax error on token(s), misplaced construct(s)\nSyntax error on token \"/\", delete this token\nSyntax error on token \"<\", @ expected\nSyntax error on token \"=\", <= expected\nSyntax error on token \"/\", delete this token\nSyntax error on token \"<\", invalid Expression\n"
bblfsh_1       | bblfsh.DriverException: exception writing response
bblfsh_1       |        at bblfsh.Driver.processOne(Driver.java:54)
bblfsh_1       |        at bblfsh.Driver.run(Driver.java:28)
bblfsh_1       |        at bblfsh.Main.main(Main.java:11)
bblfsh_1       | Caused by: com.fasterxml.jackson.databind.JsonMappingException: String index out of range: -17 (through reference chain: bblfsh.Response["ast"])
bblfsh_1       |        at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:388)
bblfsh_1       |        at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:348)
bblfsh_1       |        at com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:343)
bblfsh_1       |        at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:698)
bblfsh_1       |        at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)
bblfsh_1       |        at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:292)
bblfsh_1       |        at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3681)
bblfsh_1       |        at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:3014)
bblfsh_1       |        at bblfsh.ResponseWriter.write(ResponseWriter.java:43)
bblfsh_1       |        at bblfsh.Driver.processOne(Driver.java:52)
bblfsh_1       |        ... 2 more
bblfsh_1       | Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -17
bblfsh_1       |        at java.lang.String.substring(String.java:1931)
bblfsh_1       |        at bblfsh.CommentVisitor.visit(CommentVisitor.java:33)
bblfsh_1       |        at org.eclipse.jdt.core.dom.LineComment.accept0(LineComment.java:111)
bblfsh_1       |        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2711)
bblfsh_1       |        at bblfsh.CompilationUnitSerializer.serializeAll(CompilationUnitSerializer.java:80)
bblfsh_1       |        at bblfsh.CompilationUnitSerializer.serialize(CompilationUnitSerializer.java:38)
bblfsh_1       |        at bblfsh.CompilationUnitSerializer.serialize(CompilationUnitSerializer.java:17)
bblfsh_1       |        at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704)
bblfsh_1       |        at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:690)
bblfsh_1       |        ... 8 more

It's quite hard to detect the offending code, since this was from a big gitbase query run.