diff --git a/CHANGELOG.md b/CHANGELOG.md
index 81f8fed35..7404914c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.18.7] - 2022-07-29
+### Fixed
+- New ad unit size error
+
 ## [1.18.6] - 2022-07-20
 ### Fixed
 - Handling missing ad unit's size
@@ -454,7 +458,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Publisher features (Sites & AdUnits)
 
 
-[Unreleased]: https://github.com/adshares/adpanel/compare/v1.18.6...develop
+[Unreleased]: https://github.com/adshares/adpanel/compare/v1.18.7...develop
+[1.18.7]: https://github.com/adshares/adpanel/compare/v1.18.6...v1.18.7
 [1.18.6]: https://github.com/adshares/adpanel/compare/v1.18.5...v1.18.6
 [1.18.5]: https://github.com/adshares/adpanel/compare/v1.18.4...v1.18.5
 [1.18.4]: https://github.com/adshares/adpanel/compare/v1.18.2...v1.18.4
diff --git a/src/app/publisher/edit-site/edit-site-create-ad-units/edit-site-create-ad-units.component.html b/src/app/publisher/edit-site/edit-site-create-ad-units/edit-site-create-ad-units.component.html
index e4fd0a5e4..90045e584 100644
--- a/src/app/publisher/edit-site/edit-site-create-ad-units/edit-site-create-ad-units.component.html
+++ b/src/app/publisher/edit-site/edit-site-create-ad-units/edit-site-create-ad-units.component.html
@@ -97,6 +97,7 @@
                   class="dwmth-form-input"
                   formControlName="name"
                   data-test="publisher-edit-site-create-ad-units-form-short-headline"
+                  [readonly]="!adUnitForm.get('size').value && adUnitForm.get('saved').value"
                 >
                 <span
                   *ngIf="adUnitForm.get('name').valid"
@@ -141,7 +142,7 @@
             Ad unit size
           </div>
           <div
-            *ngIf="createSiteMode || adUnitForm.get('size').value"
+            *ngIf="adUnitForm.get('size').value || !adUnitForm.get('saved').value"
             [ngClass]="filteredAdUnitSizes[adUnitIndex].length > 4 ? 'justify-between' : 'justify-start'"
             class="row"
           >
@@ -193,7 +194,7 @@
             </div>
           </div>
           <div
-            *ngIf="!createSiteMode && !adUnitForm.get('size').value"
+            *ngIf="!adUnitForm.get('size').value && adUnitForm.get('saved').value"
             class="row"
           >
             <span class="error-msg">
diff --git a/src/app/publisher/edit-site/edit-site-create-ad-units/edit-site-create-ad-units.component.ts b/src/app/publisher/edit-site/edit-site-create-ad-units/edit-site-create-ad-units.component.ts
index bdb6691b8..e5ebd26ab 100644
--- a/src/app/publisher/edit-site/edit-site-create-ad-units/edit-site-create-ad-units.component.ts
+++ b/src/app/publisher/edit-site/edit-site-create-ad-units/edit-site-create-ad-units.component.ts
@@ -86,7 +86,7 @@ export class EditSiteCreateAdUnitsComponent extends HandleSubscription implement
 
         if (savedAdUnits.length > 0) {
           savedAdUnits.forEach((savedAdUnit, index) => {
-            this.adUnitForms.push(this.generateFormField(savedAdUnit));
+            this.adUnitForms.push(this.generateFormField(savedAdUnit, true));
             this.adUnitPanelsStatus[index] = false;
             this.selectChosenSize(savedAdUnit, index);
           });
@@ -120,7 +120,7 @@ export class EditSiteCreateAdUnitsComponent extends HandleSubscription implement
     }
   }
 
-  generateFormField(adUnit: Partial<AdUnit>): FormGroup {
+  generateFormField(adUnit: Partial<AdUnit>, saved: boolean = false): FormGroup {
     this.filteredAdUnitSizes.push(cloneDeep(this.adUnitSizes));
     this.allAdUnitSizes.push(cloneDeep(this.adUnitSizes));
 
@@ -133,6 +133,7 @@ export class EditSiteCreateAdUnitsComponent extends HandleSubscription implement
       label: new FormControl(adUnit.label, Validators.required),
       tags: new FormControl(adUnit.tags, Validators.required),
       id: new FormControl(adUnit.id),
+      saved: new FormControl(saved)
     });
   }