Getting java null pointer issue in importing 88mb xlsx file

[satyamobifyi]

java.lang.NullPointerException
at com.codingchili.excelastic.model.ExcelParser.free(ExcelParser.java:129)
at com.codingchili.excelastic.controller.Website.lambda$parse$12(Website.java:217)
at io.vertx.core.impl.ContextImpl.lambda$executeBlocking$2(ContextImpl.java:272)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:834)