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Title: NullPointerException on javax.help.MergeHelpUtilities.mergeNodeChildren() · Issue #41 · javaee/javahelp · GitHub

Open Graph Title: NullPointerException on javax.help.MergeHelpUtilities.mergeNodeChildren() · Issue #41 · javaee/javahelp

X Title: NullPointerException on javax.help.MergeHelpUtilities.mergeNodeChildren() · Issue #41 · javaee/javahelp

Description: java.lang.NullPointerException at javax.help.MergeHelpUtilities.mergeNodeChildren(MergeHelpUtilities.java:89) at javax.help.plaf.basic.BasicTOCNavigatorUI.loadData(BasicTOCNavigatorUI.java:218) at javax.help.plaf.basic.BasicTOCNavigatorU...

Open Graph Description: java.lang.NullPointerException at javax.help.MergeHelpUtilities.mergeNodeChildren(MergeHelpUtilities.java:89) at javax.help.plaf.basic.BasicTOCNavigatorUI.loadData(BasicTOCNavigatorUI.java:218) at ...

X Description: java.lang.NullPointerException at javax.help.MergeHelpUtilities.mergeNodeChildren(MergeHelpUtilities.java:89) at javax.help.plaf.basic.BasicTOCNavigatorUI.loadData(BasicTOCNavigatorUI.java:218) at ...

Opengraph URL: https://github.com/javaee/javahelp/issues/41

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Hey, it has json ld scripts: 
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og:image:altjava.lang.NullPointerException at javax.help.MergeHelpUtilities.mergeNodeChildren(MergeHelpUtilities.java:89) at javax.help.plaf.basic.BasicTOCNavigatorUI.loadData(BasicTOCNavigatorUI.java:218) at ...
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