Hi,

I’m getting the above error when using Gurobi to solve an LP and then querying the value of a constraint. The LP has been solved such that `@assert(termination_status(𝓜) == MOI.OPTIMAL)`

passes. Unfortunately, I haven’t been able to replicate the problem with a small test case yet, so this is more of a “has anyone else seen this?” than a helpful report.

Code that *doesn’t* exhibit the problem is:

```
using JuMP, Gurobi
M = Model(Gurobi.Optimizer)
@variable M a >= 0
@variable M b >= 0
@constraint M c a + b <= 1
@constraint M d a + b <= 1
@constraint M e a + b <= 2
@objective M Max a + 2 * b
optimize!(M)
value(M[:c])
value(M[:d])
value(M[:e])
```

Where I was guessing that perhaps it would have a problem with one of the constraints, but it doesn’t. The model causing the problem works with GLPK, and, until a recent change that I can’t pin down, seemed to work with Gurobi.

Sorry for the vague report, but, any ideas?

Thanks!

Geoff