diff --git a/packages/backend-core/src/redis/redis.ts b/packages/backend-core/src/redis/redis.ts
index 7bd524b18c..55d43e4f60 100644
--- a/packages/backend-core/src/redis/redis.ts
+++ b/packages/backend-core/src/redis/redis.ts
@@ -334,6 +334,9 @@ class RedisWrapper {
 
   async increment(key: string) {
     const result = await this.getClient().incr(addDbPrefix(this._db, key))
+    if (isNaN(result)) {
+      throw new Error(`Redis ${key} does not contains a number`)
+    }
     return result
   }
 }
diff --git a/packages/backend-core/src/redis/tests/redis.spec.ts b/packages/backend-core/src/redis/tests/redis.spec.ts
index 31106e1765..f7038d6d5e 100644
--- a/packages/backend-core/src/redis/tests/redis.spec.ts
+++ b/packages/backend-core/src/redis/tests/redis.spec.ts
@@ -146,5 +146,16 @@ describe("redis", () => {
       expect(results).toHaveLength(100)
       expect(results).toEqual(Array.from({ length: 100 }).map((_, i) => i + 1))
     })
+
+    it.each([
+      generator.word(),
+      generator.bool(),
+      { [generator.word()]: generator.word() },
+    ])("cannot increment if the store value is not a number", async value => {
+      const key = structures.uuid()
+      await redis.store(key, value)
+
+      await expect(redis.increment(key)).rejects.toThrowError("")
+    })
   })
 })