Illegal XML character error when saving experiments

Illegal XML character error when saving experiments

PLATFORM:
ELN Version: 9.0.127
Adobe Version: 6.x

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ERROR ON SAVING CONTENTS: Sorry, while saving (...) experiment "xxxx-xxxx-xx", an error ocurres
while trying to connect to the server (Server: XML Parser failed at linenumber X, lineposition X,
reason is: Illegal xml character.

To discard any changes and continue, click Yes.
To back up any changes, make further changes or try to save again, click No.

Do you want to discard any changes made to (...) experiment "xxxx-xxxx-xxx" and continue?
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PROBLEM:
When user tries to save an experiment an Error Saving Contents appears indicating the
connection with the server failed, due a problem with the XML parser. The parser crashes due to
an illegal XML character.

CAUSE:
The problem raises if there is PDF imported into an Image Section. Apparently, it causes the
parser to crash, making the connection with server to fail.