diff --git a/pkg/file/types.go b/pkg/file/types.go
index 0c78789..d7dd6d4 100644
--- a/pkg/file/types.go
+++ b/pkg/file/types.go
@@ -949,7 +949,7 @@ func (f *FCustomEntity) UnmarshalJSON(b []byte) error {
 		}
 		return copyToFCustomEntity(entity, f)
 	default:
-		return fmt.Errorf("unknown entity type: %s", *f.Type)
+		return fmt.Errorf("unknown entity type: %s", temp["type"])
 	}
 }
 
diff --git a/tests/integration/sync_test.go b/tests/integration/sync_test.go
index a159e69..d5c6938 100644
--- a/tests/integration/sync_test.go
+++ b/tests/integration/sync_test.go
@@ -7593,7 +7593,7 @@ func Test_Sync_DegraphqlRoutes(t *testing.T) {
 		currentState, err := fetchCurrentState(ctx, client, dumpConfig)
 		require.NoError(t, err)
 
-		targetState := stateFromFile(ctx, t, "testdata/sync/036-degraphql-routes/kong.yaml", client, dumpConfig)
+		targetState := stateFromFile(ctx, t, "testdata/sync/037-degraphql-routes/kong.yaml", client, dumpConfig)
 		syncer, err := deckDiff.NewSyncer(deckDiff.SyncerOpts{
 			CurrentState: currentState,
 			TargetState:  targetState,
@@ -7625,7 +7625,7 @@ func Test_Sync_DegraphqlRoutes(t *testing.T) {
 		currentState, err := fetchCurrentState(ctx, client, dumpConfig)
 		require.NoError(t, err)
 
-		targetState := stateFromFile(ctx, t, "testdata/sync/036-degraphql-routes/kong-complex-query.yaml", client, dumpConfig)
+		targetState := stateFromFile(ctx, t, "testdata/sync/037-degraphql-routes/kong-complex-query.yaml", client, dumpConfig)
 		syncer, err := deckDiff.NewSyncer(deckDiff.SyncerOpts{
 			CurrentState: currentState,
 			TargetState:  targetState,
@@ -7654,3 +7654,11 @@ func Test_Sync_DegraphqlRoutes(t *testing.T) {
 		assert.Equal(t, expectedMethods, degraphqlRoutes[0].Methods)
 	})
 }
+
+func Test_Sync_CustomEntities_Fake(t *testing.T) {
+	runWhen(t, "enterprise", ">=3.0.0")
+	setup(t)
+	err := sync("testdata/sync/037-degraphql-routes/kong-fake-entity.yaml")
+	require.Error(t, err)
+	assert.ErrorContains(t, err, "unknown entity type: fake-entity")
+}
diff --git a/tests/integration/testdata/sync/036-degraphql-routes/kong-complex-query.yaml b/tests/integration/testdata/sync/037-degraphql-routes/kong-complex-query.yaml
similarity index 100%
rename from tests/integration/testdata/sync/036-degraphql-routes/kong-complex-query.yaml
rename to tests/integration/testdata/sync/037-degraphql-routes/kong-complex-query.yaml
diff --git a/tests/integration/testdata/sync/037-degraphql-routes/kong-fake-entity.yaml b/tests/integration/testdata/sync/037-degraphql-routes/kong-fake-entity.yaml
new file mode 100644
index 0000000..d764327
--- /dev/null
+++ b/tests/integration/testdata/sync/037-degraphql-routes/kong-fake-entity.yaml
@@ -0,0 +1,5 @@
+_format_version: "3.0"
+custom_entities:
+- type: fake-entity
+  fields:
+    foo: bar
\ No newline at end of file
diff --git a/tests/integration/testdata/sync/036-degraphql-routes/kong.yaml b/tests/integration/testdata/sync/037-degraphql-routes/kong.yaml
similarity index 100%
rename from tests/integration/testdata/sync/036-degraphql-routes/kong.yaml
rename to tests/integration/testdata/sync/037-degraphql-routes/kong.yaml