Reading a NULL value causes disconnection

Hello,

Every time a node I'm subscribed to is read as null, the client disconnects. The type of the node I'm trying to read is a float if that matters.

OPCUA Interface - Subscription with ClientHandle 78 Value Changed ns=2;s=NodeA Value [25,1]
OPCUA Interface - Subscription with ClientHandle 80 Value Changed ns=2;s=NodeB Value [140305,5]
OPCUA Interface - Subscription with ClientHandle 80 Value Changed ns=2;s=NodeB Value [140207,5]

OPCUA Interface - Subscription with ClientHandle 88 Value Changed ns=2;s=NodeC Value [NULL]

OPCUA Interface - Client Disconnected

This happens with any node, whenever a value is written as [NULL]

Any help would be appreciated about how to make it so that the program doesn't crash.

Thank you.