diff --git a/Project.toml b/Project.toml
index e453826..ea62801 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "QDLDL"
 uuid = "bfc457fd-c171-5ab7-bd9e-d5dbfc242d63"
 authors = ["Paul Goulart <paul.goulart@eng.ox.ac.uk>"]
-version = "0.4.0"
+version = "0.4.1"
 
 
 [deps]
diff --git a/src/QDLDL.jl b/src/QDLDL.jl
index 0ed0d9c..7cb1171 100644
--- a/src/QDLDL.jl
+++ b/src/QDLDL.jl
@@ -214,7 +214,7 @@ function update_values!(
     triuA   = F.workspace.triuA     #post permutation internal data
     AtoPAPt = F.workspace.AtoPAPt   #mapping from input matrix entries to triuA
 
-    if isnothing(AtoPAPt)
+    if AtoPAPt === nothing
         @views triuA.nzval[indices] .= values
     else
         @views triuA.nzval[AtoPAPt[indices]] .= values
@@ -233,7 +233,7 @@ function scale_values!(
     triuA   = F.workspace.triuA     #post permutation internal data
     AtoPAPt = F.workspace.AtoPAPt   #mapping from input matrix entries to triuA
 
-    if isnothing(AtoPAPt)
+    if AtoPAPt === nothing
         @views triuA.nzval[indices] .*= scale
     else
         @views triuA.nzval[AtoPAPt[indices]] .*= scale