diff --git a/app/imports/ui/properties/components/actions/ActionCard.vue b/app/imports/ui/properties/components/actions/ActionCard.vue
index 140293a4..4da52fca 100644
--- a/app/imports/ui/properties/components/actions/ActionCard.vue
+++ b/app/imports/ui/properties/components/actions/ActionCard.vue
@@ -146,7 +146,7 @@ export default {
       return Math.max(this.model.usesResult, 0);
     },
     usesLeft(){
-      return Math.max(this.model.usesResult - this.model.usesUsed, 0);
+      return Math.max(this.model.usesResult - (this.model.usesUsed || 0), 0);
     },
     propertyName(){
       return getPropertyName(this.model.type);
diff --git a/app/imports/ui/properties/viewers/ActionViewer.vue b/app/imports/ui/properties/viewers/ActionViewer.vue
index 0b73c3ab..12f91a69 100644
--- a/app/imports/ui/properties/viewers/ActionViewer.vue
+++ b/app/imports/ui/properties/viewers/ActionViewer.vue
@@ -168,7 +168,7 @@ export default {
       return Math.max(this.model.usesResult, 0);
     },
     usesLeft(){
-      return Math.max(this.model.usesResult - this.model.usesUsed, 0);
+      return Math.max(this.model.usesResult - (this.model.usesUsed || 0), 0);
     },
     actionTypeIcon() {
       return `$vuetify.icons.${this.model.actionType}`;