From 444f69eb8ca4c7ec4a73212715b325db6f3cb420 Mon Sep 17 00:00:00 2001
From: Avik Pal <avikpal@mit.edu>
Date: Tue, 29 Aug 2023 11:26:41 -0400
Subject: [PATCH] Error on misspecifying arguments

---
 src/sensitivity_algorithms.jl | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/sensitivity_algorithms.jl b/src/sensitivity_algorithms.jl
index 504542fcf..789be4150 100644
--- a/src/sensitivity_algorithms.jl
+++ b/src/sensitivity_algorithms.jl
@@ -1148,7 +1148,12 @@ function setvjp(sensealg::SteadyStateAdjoint{CJ, CS, AD, FDT, VJP, LS, LM},
 end
 
 needs_concrete_jac(::SteadyStateAdjoint, ::SSAdjointFullJacobianLinsolve, _) = true
-needs_concrete_jac(::SteadyStateAdjoint, ::SSAdjointIterativeVJPLinsolve, _) = false
+function needs_concrete_jac(S::SteadyStateAdjoint, ::SSAdjointIterativeVJPLinsolve, _)
+    if S.linsolve !== nothing && LinearSolve.needs_concrete_A(S.linsolve)
+        error("$(S.linsolve) requires a concrete Matrix. Cannot be solved using the Iterative VJPs!")
+    end
+    return false
+end
 function needs_concrete_jac(S::SteadyStateAdjoint, L::SSAdjointHeuristicLinsolve, u0)
     return length(u0) ≤ L.auto_switch_threshold
 end