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Crashing on cRIO 9045

We are experiencing some random LVRT application crashing on several cRIO's running the same code.  The LabView failure log has the following error in it (actually several of the same message)

 

#Desc: LabVIEW caught fatal signal
20.0 - Received SIGSEGV
Reason: address not mapped to object
Attempt to reference address: 0x(nil)
#RCS: unspecified
#OSName: Linux
#OSVers: 4.14.146-rt67-cg-8.0.0f1-x64-139
#OSBuild: 265874
#AppName: lvrt
#Version: 20.0
#AppKind: AppLib
#AppModDate:
0x00007F35517497B1 - CopyLStr + 21
0x00007F35517019D4 - <unknown> + 0
0x00007F3551701CF1 - <unknown> + 0
0x00007F3551573A44 - SetEventNodeVariantData + C4
0x0000000001BD4D51 - <unknown> + 0

 

From the log I get that it is a seg fault caused by a null pointer (Attempt to reference address: 0x(nil)) and it appears it is a CopyLStr that is throwing this (CopyLStr + 21).  My real question here is what does the +21 mean at the end of the CopyLStr?

 

And, any ideas on where to start looking?

 

Thanks

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