When you create a webform field with for example a "Checkboxes" element and link it to an "unlimited" textfield. Multiple errors are throw by checkMaxFieldSizeExceeded and substr becaus they both expect a String and the value that webform returns is an Array.
Make a webform with a "Checkboxes" field and try to link it to an "unlimited" textfield in an Entity
Check if the value is an Array before doing the "checkMaxFieldSizeExceeded" check.
See my patch for a proposed solution
Fixed
2.0
Code
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Hello jeroenbegyn,
Thank you for your patch. It is already applied in 2.0.x branch (2.0.3).
Best regards.