diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index e84fcd3a8eaab2cfb5f956536fee97ebe837e1f1..e40fc5f9fbd2c155670e5ed9c6ddc94f33320526 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -14,6 +14,7 @@ Changed
 
 * Announcements are shown in calendar.
 * DialogObjectForm is now slightly wider.
+* [Dev] DialogObjectForm now implicitly handles a missing isCreate-prop depending on the presence of editItem.
 
 Fixed
 ~~~~~
diff --git a/aleksis/core/frontend/mixins/createOrPatchPropsMixin.js b/aleksis/core/frontend/mixins/createOrPatchPropsMixin.js
index c9122136924a7d9f0c9f2d320745d6fe03d1c755..5b0cf78d2eadaccf173099737f296ed1bf40c66f 100644
--- a/aleksis/core/frontend/mixins/createOrPatchPropsMixin.js
+++ b/aleksis/core/frontend/mixins/createOrPatchPropsMixin.js
@@ -15,7 +15,7 @@ export default {
     isCreate: {
       type: Boolean,
       required: false,
-      default: true,
+      default: undefined,
     },
     /**
      * The graphQL create mutation
diff --git a/aleksis/core/frontend/mixins/objectFormMixin.js b/aleksis/core/frontend/mixins/objectFormMixin.js
index 6797590d23f678da63fe456528c7ccce85443e5b..08bd7ff7875c1c5319d3b610baea7d67f0af13db 100644
--- a/aleksis/core/frontend/mixins/objectFormMixin.js
+++ b/aleksis/core/frontend/mixins/objectFormMixin.js
@@ -55,6 +55,13 @@ export default {
       this.resetModel();
     },
     resetModel() {
+      // Handle isCreate undefined, by deciding on the presence of editItem
+      //   This implicit behaviour often makes more sense
+      //   and doing it higher up (in parent) makes parent less flexible.
+      //   Specifically not working anymore with CRUD.
+      if (!this.isCreate) {
+        this.isCreate = !this.editItem;
+      }
       this.itemModel = JSON.parse(
         JSON.stringify(this.isCreate ? this.defaultItem : this.editItem),
       );