diff --git a/src/PropertyT.jl b/src/PropertyT.jl
index 101c5da..35937e8 100644
--- a/src/PropertyT.jl
+++ b/src/PropertyT.jl
@@ -150,7 +150,7 @@ end
 
 function compute_λandP(m, varλ, varP)
     λ = 0.0
-    P = Vector{Nullable{Array{Float64,2}}}
+    P = nothing
     while λ == 0.0
         try
             solve_SDP(m)