After an action in the XPhone Connect Client (e.g. when calling call notes / when connecting address books), an error appears with the message: "The object reference was not set to an object instance".
The email client must have all the defaults in the control panel.
Follow these steps for Windows 10 (older operating systems may differ):
Finally, select your email client from the list of possible file type and protocol mappings for each option.
XPhone Connect searches for the default email client in the following registry keys:
On the right side of the key "(Default)" is the name of the default e-mail client. If there is not the desired e-mail client, replace the value with the correct e-mail client. Use the name of the respective subkey of HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432node\Clients\Mail as independent keys, e.g. "Microsoft Outlook" or "IBM Notes".
If this does not solve the problem, check whether the Microsoft Office installation on the affected workstations was still 32-bit at the time of the XPhone Client installation and has now been changed to Microsoft Office 64-bit (or vice versa, if applicable), possibly in the course of an update to a newer Office version. If this is the case, perform a repair installation for XPhone Connect Client. This is necessary because the Microsoft Office platform is determined dynamically during the installation (32- or 64-bit) and thus the appropriate components are installed. During a repair installation, this detection is run again and the installation is corrected accordingly.