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Collection was modified; enumeration operation may not execute

Question asked by spyros.m on Jun 9, 2015
Latest reply on Aug 12, 2015 by spyros.m

Hi there,

 

On random times (and random activity types) our workflows crash with the following error:

Collection was modified; enumeration operation may not execute.    

 

Looking at the ULS logs (stack trace) the following Nintex internal functions are getting called:

Nintex.Workflow.Common.StringFunctionParser.Execute(String Input, SPWeb web) Nintex.Workflow.HumanApproval.Message.AddContextDataToString(String input, NWContextDataCollection data, Boolean escapeValuesForSql, Boolean decodeInput, Boolean allowSensitive, Boolean esc...)

 

The behavior is not stable so I can't tell how to reproduce this. It happens to very small or larger workflows. Any ideas?

 

We are using Nintex Workflow 2010.

 

Thanks,

Spyros

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