diff --git a/packages/worker/src/api/controllers/global/users.ts b/packages/worker/src/api/controllers/global/users.ts
index 0520990f2f..b0e3219656 100644
--- a/packages/worker/src/api/controllers/global/users.ts
+++ b/packages/worker/src/api/controllers/global/users.ts
@@ -195,7 +195,11 @@ export const search = async (ctx: Ctx<SearchUsersRequest>) => {
       if (filters && typeof filters === "object") {
         for (let [field, value] of Object.entries(filters)) {
           delete filters[field]
-          filters[db.removeKeyNumbering(field)] = value
+          const cleanedField = db.removeKeyNumbering(field)
+          if (filters[cleanedField] !== undefined) {
+            ctx.throw(400, "Only 1 filter per field is supported")
+          }
+          filters[cleanedField] = value
         }
       }
     }
diff --git a/packages/worker/src/api/routes/global/tests/users.spec.ts b/packages/worker/src/api/routes/global/tests/users.spec.ts
index 1365173b21..c792de70a9 100644
--- a/packages/worker/src/api/routes/global/tests/users.spec.ts
+++ b/packages/worker/src/api/routes/global/tests/users.spec.ts
@@ -617,6 +617,36 @@ describe("/api/global/users", () => {
       expect(response.body.data[0]._id).toBe(user._id)
     })
 
+    it("should throw an error when using multiple filters on the same field", async () => {
+      const user = await config.createUser()
+      await config.api.users.searchUsers(
+        {
+          query: {
+            string: {
+              ["1:email"]: user.email,
+              ["2:email"]: "something else",
+            },
+          },
+        },
+        { status: 400 }
+      )
+    })
+
+    it("should throw an error when using multiple filters on the same field without prefixes", async () => {
+      const user = await config.createUser()
+      await config.api.users.searchUsers(
+        {
+          query: {
+            string: {
+              ["_id"]: user.email,
+              ["999:_id"]: "something else",
+            },
+          },
+        },
+        { status: 400 }
+      )
+    })
+
     it("should throw an error when unimplemented options used", async () => {
       const user = await config.createUser()
       await config.api.users.searchUsers(