diff --git a/exercises/practice/space-age/.meta/example.gd b/exercises/practice/space-age/.meta/example.gd
index b2cf53b..873dcd2 100644
--- a/exercises/practice/space-age/.meta/example.gd
+++ b/exercises/practice/space-age/.meta/example.gd
@@ -14,5 +14,7 @@ var orbital_periods = {
 
 
 func on_planet(planet, seconds):
-	var ratio = orbital_periods.get(planet)
+	if planet not in orbital_periods:
+		return null
+	var ratio = orbital_periods[planet]
 	return seconds / EARTH_SECONDS / ratio
diff --git a/exercises/practice/space-age/.meta/template.j2 b/exercises/practice/space-age/.meta/template.j2
index ca6c79f..bf9c387 100644
--- a/exercises/practice/space-age/.meta/template.j2
+++ b/exercises/practice/space-age/.meta/template.j2
@@ -5,8 +5,13 @@ func _round(value):
 {% for case in cases %}
 func test_{{ case.func_name }}(solution_script):
 	var got = solution_script.on_planet({{ case.input.planet | togdscript }}, {{ case.input.seconds }})
+{%- if not case.expect_error %}
 	var want = {{ case.expected }}
 	return [_round(got), _round(want)]
+{%- else %}
+	var want = null
+	return [got, want]
+{%- endif %}
 
 {% endfor %}
 
diff --git a/exercises/practice/space-age/.meta/tests.toml b/exercises/practice/space-age/.meta/tests.toml
index a62017e..7957bb7 100644
--- a/exercises/practice/space-age/.meta/tests.toml
+++ b/exercises/practice/space-age/.meta/tests.toml
@@ -35,4 +35,3 @@ description = "age on Neptune"
 
 [57b96e2a-1178-40b7-b34d-f3c9c34e4bf4]
 description = "invalid planet causes error"
-include = false
diff --git a/exercises/practice/space-age/space_age_test.gd b/exercises/practice/space-age/space_age_test.gd
index 884ff1a..b638b31 100644
--- a/exercises/practice/space-age/space_age_test.gd
+++ b/exercises/practice/space-age/space_age_test.gd
@@ -49,3 +49,9 @@ func test_age_on_neptune(solution_script):
 	var got = solution_script.on_planet("Neptune", 1821023456)
 	var want = 0.35
 	return [_round(got), _round(want)]
+
+
+func test_invalid_planet_causes_error(solution_script):
+	var got = solution_script.on_planet("Sun", 680804807)
+	var want = null
+	return [got, want]