Repro steps:
1. Add a Look At node
2. Add a Vector3 node
3. Connect the Vector3 into the 'To' input of the Look At node. Errors are thrown:

Assertion failed on expression: 'CompareApproximately(det, 1.0F, .005f)'
Assertion failed on expression: 'fRoot >= Vector3f::epsilon'
QuaternionToEuler: Input quaternion was not normalized
Assertion failed on expression: 'IsFinite(rot)'
UnityEditor.EditorApplication:Internal_CallUpdateFunctions ()

Expected outcome: no errors.

Note:
- connecting an inline only causes the issue as it sets 'To' to (0,0,0).