diff --git a/src/lib/db/feature-strategy-store.ts b/src/lib/db/feature-strategy-store.ts
index b230aac436..6ecb5c6e0e 100644
--- a/src/lib/db/feature-strategy-store.ts
+++ b/src/lib/db/feature-strategy-store.ts
@@ -15,6 +15,8 @@ import {
 } from '../types/model';
 import { IFeatureStrategiesStore } from '../types/stores/feature-strategies-store';
 import { PartialSome } from '../types/partial';
+import { ensureStringValue } from '../util/ensureStringValue';
+import { mapValues } from '../util/map-values';
 
 const COLUMNS = [
     'id',
@@ -53,15 +55,6 @@ interface IFeatureStrategiesTable {
     created_at?: Date;
 }
 
-function ensureStringValues(data: object): { [key: string]: string } {
-    const stringEntries = Object.entries(data).map(([key, value]) => [
-        key,
-        String(value),
-    ]);
-
-    return Object.fromEntries(stringEntries);
-}
-
 function mapRow(row: IFeatureStrategiesTable): IFeatureStrategy {
     return {
         id: row.id,
@@ -69,7 +62,7 @@ function mapRow(row: IFeatureStrategiesTable): IFeatureStrategy {
         projectId: row.project_name,
         environment: row.environment,
         strategyName: row.strategy_name,
-        parameters: ensureStringValues(row.parameters),
+        parameters: mapValues(row.parameters || {}, ensureStringValue),
         constraints: (row.constraints as unknown as IConstraint[]) || [],
         createdAt: row.created_at,
         sortOrder: row.sort_order,
diff --git a/src/lib/db/feature-toggle-client-store.ts b/src/lib/db/feature-toggle-client-store.ts
index e97ac62f1c..96f005f149 100644
--- a/src/lib/db/feature-toggle-client-store.ts
+++ b/src/lib/db/feature-toggle-client-store.ts
@@ -11,6 +11,8 @@ import { IFeatureToggleClientStore } from '../types/stores/feature-toggle-client
 import { DEFAULT_ENV } from '../util/constants';
 import { PartialDeep } from '../types/partial';
 import EventEmitter from 'events';
+import { ensureStringValue } from '../util/ensureStringValue';
+import { mapValues } from '../util/map-values';
 
 export interface FeaturesTable {
     name: string;
@@ -180,7 +182,7 @@ export default class FeatureToggleClientStore
             id: row.strategy_id,
             name: row.strategy_name,
             constraints: row.constraints || [],
-            parameters: row.parameters,
+            parameters: mapValues(row.parameters || {}, ensureStringValue),
         };
     }
 
diff --git a/src/lib/util/ensureStringValue.test.ts b/src/lib/util/ensureStringValue.test.ts
new file mode 100644
index 0000000000..dd8ccb6035
--- /dev/null
+++ b/src/lib/util/ensureStringValue.test.ts
@@ -0,0 +1,16 @@
+import { ensureStringValue } from './ensureStringValue';
+
+test('ensureStringValue', () => {
+    expect(ensureStringValue(null)).toEqual('');
+    expect(ensureStringValue(undefined)).toEqual('');
+    expect(ensureStringValue('null')).toEqual('null');
+    expect(ensureStringValue('undefined')).toEqual('undefined');
+
+    expect(ensureStringValue('')).toEqual('');
+    expect(ensureStringValue('a')).toEqual('a');
+    expect(ensureStringValue(0)).toEqual('0');
+    expect(ensureStringValue(true)).toEqual('true');
+
+    expect(ensureStringValue({})).toEqual('{}');
+    expect(ensureStringValue({ b: 1 })).toEqual('{"b":1}');
+});
diff --git a/src/lib/util/ensureStringValue.ts b/src/lib/util/ensureStringValue.ts
new file mode 100644
index 0000000000..10c8f5e0c0
--- /dev/null
+++ b/src/lib/util/ensureStringValue.ts
@@ -0,0 +1,13 @@
+import { isDefined } from './isDefined';
+
+export function ensureStringValue(value: unknown): string {
+    if (!isDefined(value)) {
+        return '';
+    }
+
+    if (typeof value === 'object') {
+        return JSON.stringify(value);
+    }
+
+    return String(value);
+}