diff --git a/web/app/cad/craft/primitives/box/boxOpSchema.js b/web/app/cad/craft/primitives/box/boxOpSchema.js
index 80dd5edd..3ce5dc1c 100644
--- a/web/app/cad/craft/primitives/box/boxOpSchema.js
+++ b/web/app/cad/craft/primitives/box/boxOpSchema.js
@@ -1,6 +1,7 @@
 export default {
   datum: {
     type: 'datum',
+    optional: true,
     defaultValue: {type: 'selection'}
   },
   width: {
diff --git a/web/app/cad/craft/primitives/cone/coneOpSchema.js b/web/app/cad/craft/primitives/cone/coneOpSchema.js
index b9524b3a..1ee5f25a 100644
--- a/web/app/cad/craft/primitives/cone/coneOpSchema.js
+++ b/web/app/cad/craft/primitives/cone/coneOpSchema.js
@@ -1,6 +1,7 @@
 export default {
   datum: {
     type: 'datum',
+    optional: true,
     defaultValue: {type: 'selection'}
   },
   radius: {
diff --git a/web/app/cad/craft/primitives/cylinder/cylinderOpSchema.js b/web/app/cad/craft/primitives/cylinder/cylinderOpSchema.js
index 4fb6920e..66ec8e03 100644
--- a/web/app/cad/craft/primitives/cylinder/cylinderOpSchema.js
+++ b/web/app/cad/craft/primitives/cylinder/cylinderOpSchema.js
@@ -1,6 +1,7 @@
 export default {
   datum: {
     type: 'datum',
+    optional: true,
     defaultValue: {type: 'selection'}
   },
   radius: {
diff --git a/web/app/cad/craft/primitives/datumConsumingOperation.js b/web/app/cad/craft/primitives/datumConsumingOperation.js
index 6074ad99..a9e67e6d 100644
--- a/web/app/cad/craft/primitives/datumConsumingOperation.js
+++ b/web/app/cad/craft/primitives/datumConsumingOperation.js
@@ -1,6 +1,8 @@
+import CSys from '../../../math/csys';
+
 export default function datumConsumingOperation(params, services, run) {
   let mDatum = params.datum && services.cadRegistry.findDatum(params.datum);
-  let res = run(mDatum.csys);
+  let res = run(mDatum ? mDatum.csys : CSys.ORIGIN);
   if (mDatum) {
     res.consumed.push(mDatum);
   }
diff --git a/web/app/cad/craft/primitives/sphere/sphereOpSchema.js b/web/app/cad/craft/primitives/sphere/sphereOpSchema.js
index a953171a..d133e674 100644
--- a/web/app/cad/craft/primitives/sphere/sphereOpSchema.js
+++ b/web/app/cad/craft/primitives/sphere/sphereOpSchema.js
@@ -1,6 +1,7 @@
 export default {
   datum: {
     type: 'datum',
+    optional: true,
     defaultValue: {type: 'selection'}
   },
   radius: {
diff --git a/web/app/cad/craft/primitives/torus/torusOpSchema.js b/web/app/cad/craft/primitives/torus/torusOpSchema.js
index 3a02b665..8d3c370f 100644
--- a/web/app/cad/craft/primitives/torus/torusOpSchema.js
+++ b/web/app/cad/craft/primitives/torus/torusOpSchema.js
@@ -1,6 +1,7 @@
 export default {
   datum: {
     type: 'datum',
+    optional: true,
     defaultValue: {type: 'selection'}
   },
   radius: {