diff --git a/CHANGELOG.md b/CHANGELOG.md
index cf5ab1a70..054a24bdf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Improved the language localization for Chinese (`zh`)
 
+### Fixed
+
+- Resolved a validation error caused by empty strings in the asset profile details dialog of the admin control panel
+
 ## 3.39.0 - 2026-08-01
 
 ### Changed
diff --git a/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.component.ts b/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.component.ts
index c5562740f..330688da1 100644
--- a/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.component.ts
+++ b/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.component.ts
@@ -11,6 +11,8 @@ import {
   DATE_FORMAT,
   getCountryName,
   getCurrencyFromSymbol,
+  getStringOrNull,
+  getStringOrUndefined,
   isCurrency
 } from '@ghostfolio/common/helper';
 import {
@@ -568,9 +570,10 @@ export class GfAssetProfileDialogComponent implements OnInit {
           this.assetProfileForm.controls.scraperConfiguration.controls.headers
             .value ?? '{}'
         ) as Record<string, string>,
-        locale:
+        locale: getStringOrUndefined(
           this.assetProfileForm.controls.scraperConfiguration.controls.locale
-            ?.value ?? undefined,
+            ?.value
+        ),
         mode:
           this.assetProfileForm.controls.scraperConfiguration.controls.mode
             ?.value ?? undefined,
@@ -619,7 +622,7 @@ export class GfAssetProfileDialogComponent implements OnInit {
       assetClass: this.assetProfileForm.controls.assetClass.value ?? undefined,
       assetSubClass:
         this.assetProfileForm.controls.assetSubClass.value ?? undefined,
-      comment: this.assetProfileForm.controls.comment.value ?? undefined,
+      comment: getStringOrNull(this.assetProfileForm.controls.comment.value),
       currency: this.assetProfileForm.controls.currency.value ?? undefined,
       dataGatheringFrequency:
         this.assetProfileForm.controls.dataGatheringFrequency.value ??
@@ -628,7 +631,7 @@ export class GfAssetProfileDialogComponent implements OnInit {
         ? this.assetProfileForm.controls.isActive.value
         : undefined,
       name: this.assetProfileForm.controls.name.value ?? undefined,
-      url: this.assetProfileForm.controls.url.value ?? undefined
+      url: getStringOrNull(this.assetProfileForm.controls.url.value)
     };
 
     try {
@@ -737,9 +740,10 @@ export class GfAssetProfileDialogComponent implements OnInit {
             this.assetProfileForm.controls.scraperConfiguration.controls.headers
               .value ?? '{}'
           ) as Record<string, string>,
-          locale:
+          locale: getStringOrUndefined(
             this.assetProfileForm.controls.scraperConfiguration.controls.locale
-              ?.value ?? undefined,
+              ?.value
+          ),
           mode: this.assetProfileForm.controls.scraperConfiguration.controls
             .mode?.value,
           selector:
diff --git a/libs/common/src/lib/dtos/update-asset-profile.dto.ts b/libs/common/src/lib/dtos/update-asset-profile.dto.ts
index a6e2230e8..a8eaad608 100644
--- a/libs/common/src/lib/dtos/update-asset-profile.dto.ts
+++ b/libs/common/src/lib/dtos/update-asset-profile.dto.ts
@@ -35,7 +35,7 @@ export class UpdateAssetProfileDto {
 
   @IsOptional()
   @IsString()
-  comment?: string;
+  comment?: string | null;
 
   @IsArray()
   @IsOptional()
@@ -96,5 +96,5 @@ export class UpdateAssetProfileDto {
     protocols: ['http', 'https'],
     require_protocol: true
   })
-  url?: string;
+  url?: string | null;
 }
diff --git a/libs/common/src/lib/helper.spec.ts b/libs/common/src/lib/helper.spec.ts
index d33f10452..758934724 100644
--- a/libs/common/src/lib/helper.spec.ts
+++ b/libs/common/src/lib/helper.spec.ts
@@ -1,6 +1,8 @@
 import {
   extractNumberFromString,
   getNumberFormatGroup,
+  getStringOrNull,
+  getStringOrUndefined,
   isCurrency,
   isCurrencySymbol
 } from '@ghostfolio/common/helper';
@@ -139,6 +141,62 @@ describe('Helper', () => {
     });
   });
 
+  describe('Get string or null', () => {
+    it('String', () => {
+      expect(getStringOrNull('https://ghostfol.io')).toEqual(
+        'https://ghostfol.io'
+      );
+    });
+
+    it('String (with spaces)', () => {
+      expect(getStringOrNull(' https://ghostfol.io ')).toEqual(
+        'https://ghostfol.io'
+      );
+    });
+
+    it('Empty string', () => {
+      expect(getStringOrNull('')).toEqual(null);
+    });
+
+    it('Blank string', () => {
+      expect(getStringOrNull('   ')).toEqual(null);
+    });
+
+    it('Null', () => {
+      expect(getStringOrNull(null)).toEqual(null);
+    });
+
+    it('Undefined', () => {
+      expect(getStringOrNull(undefined)).toEqual(null);
+    });
+  });
+
+  describe('Get string or undefined', () => {
+    it('String', () => {
+      expect(getStringOrUndefined('de-DE')).toEqual('de-DE');
+    });
+
+    it('String (with spaces)', () => {
+      expect(getStringOrUndefined(' de-DE ')).toEqual('de-DE');
+    });
+
+    it('Empty string', () => {
+      expect(getStringOrUndefined('')).toEqual(undefined);
+    });
+
+    it('Blank string', () => {
+      expect(getStringOrUndefined('   ')).toEqual(undefined);
+    });
+
+    it('Null', () => {
+      expect(getStringOrUndefined(null)).toEqual(undefined);
+    });
+
+    it('Undefined', () => {
+      expect(getStringOrUndefined(undefined)).toEqual(undefined);
+    });
+  });
+
   describe('Is currency', () => {
     it('ISO 4217 currency code', () => {
       expect(isCurrency('USD')).toEqual(true);
diff --git a/libs/common/src/lib/helper.ts b/libs/common/src/lib/helper.ts
index db1d3c2a2..7e482838c 100644
--- a/libs/common/src/lib/helper.ts
+++ b/libs/common/src/lib/helper.ts
@@ -397,6 +397,26 @@ export function getStartOfUtcDate(aDate: Date) {
   return date;
 }
 
+export function getStringOrNull(aString: string | null | undefined) {
+  const trimmedString = aString?.trim();
+
+  if (trimmedString) {
+    return trimmedString;
+  }
+
+  return null;
+}
+
+export function getStringOrUndefined(aString: string | null | undefined) {
+  const trimmedString = aString?.trim();
+
+  if (trimmedString) {
+    return trimmedString;
+  }
+
+  return undefined;
+}
+
 export function getSum(aArray: Big[]) {
   if (aArray?.length > 0) {
     return aArray.reduce((a, b) => a.plus(b), new Big(0));