There is a known issue in Spectrum 9.4.3 and Spectrum 9.4.4, that will cause the Secondary SpectroSERVER to crash, with an entry as a custom vendor.
This problem has been resolved in more recent releases, such as Spectrum 10.2.0.
We have the following patches available:
PTF_220.127.116.11 for Spectrum 9.4.3
PTF_9.4.408 for Spectrum 9.4.4
Please open a support case and request the patch that you require.