diff --git a/.changepacks/changepack_log_p7naE2C6FFGDsKHtw0qGs.json b/.changepacks/changepack_log_p7naE2C6FFGDsKHtw0qGs.json
new file mode 100644
index 0000000..2db9bc5
--- /dev/null
+++ b/.changepacks/changepack_log_p7naE2C6FFGDsKHtw0qGs.json
@@ -0,0 +1 @@
+{"changes":{"packages/fetch/package.json":"Patch","packages/react-query/package.json":"Patch"},"note":"Fix error without body issue","date":"2026-01-27T06:44:10.883719900Z"}
\ No newline at end of file
diff --git a/packages/fetch/src/api.ts b/packages/fetch/src/api.ts
index 5719940..16af265 100644
--- a/packages/fetch/src/api.ts
+++ b/packages/fetch/src/api.ts
@@ -29,11 +29,15 @@ export type DevupApiResponse<T, E = any> =
   | {
       data: T
       error?: undefined
+      isOk: true
+      isError: false
       response: Response
     }
   | {
       data?: undefined
       error: E
+      isOk: false
+      isError: true
       response: Response
     }
 
@@ -289,6 +293,7 @@ export class DevupApi<S extends ConditionalKeys<DevupApiServers>> {
     >
 
     let response = ret.response
+    const hasError = !ret.response.ok
     let error: unknown = ret.error
 
     for (const middleware of finalMiddleware) {
@@ -307,15 +312,15 @@ export class DevupApi<S extends ConditionalKeys<DevupApiServers>> {
       if (middleware.onResponse) {
         result = await middleware.onResponse({
           ...middlewareParams,
-          response: ret.response,
+          response,
         })
       }
 
       // Call onError if there's an error and onResponse didn't return a result
-      if (!result && error && middleware.onError) {
+      if (!result && hasError && middleware.onError) {
         result = await middleware.onError({
           ...middlewareParams,
-          error: ret.error,
+          error,
         })
       }
 
@@ -334,6 +339,8 @@ export class DevupApi<S extends ConditionalKeys<DevupApiServers>> {
     return {
       data: ret.data,
       error: error,
+      isOk: !hasError,
+      isError: hasError,
       response,
     } as DevupApiResponse<ExtractValue<O, 'response'>, ExtractValue<O, 'error'>>
   }
diff --git a/packages/react-query/src/query-client.ts b/packages/react-query/src/query-client.ts
index d97273d..b7a32bc 100644
--- a/packages/react-query/src/query-client.ts
+++ b/packages/react-query/src/query-client.ts
@@ -94,8 +94,8 @@ export class DevupQueryClient<S extends ConditionalKeys<DevupApiServers>> {
               signal,
               ...(options[0] as DevupApiRequestInit),
             })
-            .then(({ data, error }: DevupApiResponse<D, E>) => {
-              if (error) throw error
+            .then(({ data, error, isError }: DevupApiResponse<D, E>) => {
+              if (isError) throw error
               return data
             }),
         ...options[1],
@@ -149,8 +149,8 @@ export class DevupQueryClient<S extends ConditionalKeys<DevupApiServers>> {
           // biome-ignore lint/suspicious/noExplicitAny: can't use method as a function
           (this.api as any)
             [mutationKey?.[0] as string](mutationKey?.[1] as T, variables)
-            .then(({ data, error }: DevupApiResponse<D, E>) => {
-              if (error) throw error
+            .then(({ data, error, isError }: DevupApiResponse<D, E>) => {
+              if (isError) throw error
               return data
             }),
         ...queryOptions,
@@ -214,8 +214,8 @@ export class DevupQueryClient<S extends ConditionalKeys<DevupApiServers>> {
               signal,
               ...(options[0] as DevupApiRequestInit),
             })
-            .then(({ data, error }: DevupApiResponse<D, E>) => {
-              if (error) throw error
+            .then(({ data, error, isError }: DevupApiResponse<D, E>) => {
+              if (isError) throw error
               return data
             }),
         ...options[1],
@@ -290,8 +290,8 @@ export class DevupQueryClient<S extends ConditionalKeys<DevupApiServers>> {
                 },
               } as DevupApiRequestInit,
             )
-            .then(({ data, error }: DevupApiResponse<D, E>) => {
-              if (error) throw error
+            .then(({ data, error, isError }: DevupApiResponse<D, E>) => {
+              if (isError) throw error
               return data as D
             })
         },
@@ -366,8 +366,8 @@ export class DevupQueryClient<S extends ConditionalKeys<DevupApiServers>> {
                 signal,
                 ...(restOptions[0] as DevupApiRequestInit),
               })
-              .then(({ data, error }: DevupApiResponse<D, E>) => {
-                if (error) throw error
+              .then(({ data, error, isError }: DevupApiResponse<D, E>) => {
+                if (isError) throw error
                 return data
               }),
           ...queryOptions,