FreeMarker template error (HTML_DEBUG mode; use RETHROW in production!)

Directive has thrown an unchecked exception; see the cause exception.

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FTL stack trace ("~" means nesting-related):
	- Failed at: @cms_article contentId="${Content.con...  [in template "maxnervaTest_pc/template/detail.template.html" at line 296, column 33]
	- Reached through: @cms_xmodel_data modelId="${Catalog.e...  [in template "maxnervaTest_pc/template/detail.template.html" at line 93, column 9]
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Java stack trace (for programmers):
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freemarker.core._MiscTemplateException: [... Exception message was already printed; see it above ...]
	at freemarker.core.Environment.visit(Environment.java:462)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:102)
	at freemarker.core.Environment.visit(Environment.java:371)
	at freemarker.core.Environment$NestedElementTemplateDirectiveBody.render(Environment.java:3423)
	at com.chestnut.common.staticize.tag.AbstractTag.onTagEnd(AbstractTag.java:96)
	at com.chestnut.common.staticize.tag.AbstractTag.execute(AbstractTag.java:65)
	at freemarker.core.Environment.visit(Environment.java:452)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:102)
	at freemarker.core.Environment.visit(Environment.java:335)
	at freemarker.core.Environment.visit(Environment.java:341)
	at freemarker.core.Environment.visit(Environment.java:341)
	at freemarker.core.Environment.process(Environment.java:314)
	at com.chestnut.common.staticize.StaticizeService.process(StaticizeService.java:93)
	at com.chestnut.contentcore.service.impl.PublishServiceImpl.doContentStaticize(PublishServiceImpl.java:631)
	at com.chestnut.contentcore.service.impl.PublishServiceImpl.contentStaticize(PublishServiceImpl.java:595)
	at com.chestnut.contentcore.publish.ContentPublishTask.publish(ContentPublishTask.java:58)
	at com.chestnut.contentcore.publish.PublishTaskReceiver.onMessage(PublishTaskReceiver.java:57)
	at com.chestnut.contentcore.publish.PublishTaskReceiver.onMessage(PublishTaskReceiver.java:37)
	at org.springframework.data.redis.stream.StreamPollTask.deserializeAndEmitRecords(StreamPollTask.java:157)
	at org.springframework.data.redis.stream.StreamPollTask.doLoop(StreamPollTask.java:128)
	at org.springframework.data.redis.stream.StreamPollTask.run(StreamPollTask.java:112)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.NullPointerException: Cannot invoke "String.split(String)" because "contentHtml" is null
	at com.chestnut.article.template.tag.CmsArticleTag.execute0(CmsArticleTag.java:102)
	at com.chestnut.common.staticize.tag.AbstractTag.execute(AbstractTag.java:64)
	at freemarker.core.Environment.visit(Environment.java:452)
	... 23 more