We have just started getting the following error
[2020-12-22T15:57:08,056][ERROR][logstash.javapipeline ][main] Pipeline worker error, the pipeline will be stopped {:pipeline_id=>"main", :error=>"", :exception=>Java::JavaLang::NullPointerException, :backtrace=>["org.logstash.config.ir.compiler.EventCondition$Compiler$UnexpectedTypeException.(EventCondition.java:679)", "org.logstash.config.ir.compiler.EventCondition$Compiler.compare(EventCondition.java:453)", "org.logstash.config.ir.compiler.EventCondition$Compiler.lambda$compareFieldToConstant$11(EventCondition.java:444)", "org.logstash.config.ir.compiler.EventCondition$Compiler.lambda$booleanCondition$4(EventCondition.java:162)", "org.logstash.config.ir.compiler.EventCondition$Compiler.lambda$booleanCondition$4(EventCondition.java:162)", "org.logstash.config.ir.compiler.Utils.filterEvents(Utils.java:47)", "org.logstash.generated.CompiledDataset17.compute(Unknown Source)", "org.logstash.generated.CompiledDataset18.compute(Unknown Source)", "org.logstash.generated.CompiledDataset19.compute(Unknown Source)", "org.logstash.config.ir.CompiledPipeline$CompiledUnorderedExecution.compute(CompiledPipeline.java:343)", "org.logstash.config.ir.CompiledPipeline$CompiledUnorderedExecution.compute(CompiledPipeline.java:333)", "org.logstash.execution.WorkerLoop.run(WorkerLoop.java:83)", "java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)", "java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)", "java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)", "java.base/java.lang.reflect.Method.invoke(Method.java:566)", "org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(JavaMethod.java:426)", "org.jruby.javasupport.JavaMethod.invokeDirect(JavaMethod.java:293)", "org.jruby.java.invokers.InstanceMethodInvoker.call(InstanceMethodInvoker.java:24)", "org.jruby.java.invokers.InstanceMethodInvoker.call(InstanceMethodInvoker.java:86)", "org.jruby.ir.targets.InvokeSite.invoke(InvokeSite.java:207)", "usr.share.logstash.logstash_minus_core.lib.logstash.java_pipeline.RUBY$block$start_workers$5(/usr/share/logstash/logstash-core/lib/logstash/java_pipeline.rb:289)", "org.jruby.runtime.CompiledIRBlockBody.callDirect(CompiledIRBlockBody.java:138)", "org.jruby.runtime.IRBlockBody.call(IRBlockBody.java:58)", "org.jruby.runtime.IRBlockBody.call(IRBlockBody.java:52)", "org.jruby.runtime.Block.call(Block.java:139)", "org.jruby.RubyProc.call(RubyProc.java:318)", "org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:105)", "java.base/java.lang.Thread.run(Thread.java:834)"], :thread=>"#<Thread:0x2277540a sleep>"}
[2020-12-22T15:57:10,165][INFO ][logstash.runner ] Logstash shut down.