diff --git a/src/fallbacks.jl b/src/fallbacks.jl
index 2792161..9c501ad 100644
--- a/src/fallbacks.jl
+++ b/src/fallbacks.jl
@@ -95,6 +95,7 @@ issimple(t::AbstractMultiPointTrait, geom) = allunique((getgeom(t, geom)))
 issimple(t::AbstractMultiCurveTrait, geom) = all(issimple.(getgeom(t, geom)))
 isclosed(t::AbstractMultiCurveTrait, geom) = all(isclosed.(getgeom(t, geom)))
 
+crs(::Nothing, geom) = nothing
 crs(::AbstractTrait, geom) = nothing
 
 # FeatureCollection
diff --git a/test/test_primitives.jl b/test/test_primitives.jl
index d20d911..3a1cfa0 100644
--- a/test/test_primitives.jl
+++ b/test/test_primitives.jl
@@ -478,6 +478,11 @@ end
 
 end
 
+@testset "extent and crs fallback to nothing on unknown objects" begin
+    @test isnothing(GeoInterface.crs(nothing))
+    @test isnothing(GeoInterface.extent(nothing))
+end
+
 module ConvertTestModule
 using GeoInterface
 struct TestPolygon end