diff --git a/src/array_partition.jl b/src/array_partition.jl
index 0bfdd68b..23ab35b9 100644
--- a/src/array_partition.jl
+++ b/src/array_partition.jl
@@ -219,6 +219,7 @@ Base.@propagate_inbounds function Base.getindex(A::ArrayPartition, i::Int)
             return A.x[j][length(A.x[j]) + i]
         end
     end
+    throw(BoundsError(A, i))
 end
 
 """
diff --git a/test/partitions_test.jl b/test/partitions_test.jl
index 9f7aeb59..15c31655 100644
--- a/test/partitions_test.jl
+++ b/test/partitions_test.jl
@@ -1,6 +1,7 @@
 using RecursiveArrayTools, Test, Statistics, ArrayInterface
 A = (rand(5), rand(5))
 p = ArrayPartition(A)
+@inferred p[1]
 @test (p.x[1][1], p.x[2][1]) == (p[1], p[6])
 
 p = ArrayPartition(A, Val{true})